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I have a 2005 mustang GT, let me just start by telling you mods I have done.
Cold air intake, 4:10 gear ratio, steeda underdrive pulleys, comp cams (slight lope), kooks long tube headers, High flow catted X pipe, and bassini axle back exhaust, as well as a tune from bama custom tuning. Right now I'm running my 93 race tune, I am having a problem with my car when I take off at around 40 miles per hour it seems to "bog" down. It doesnt stop, but it seems as though I have to push harder on the gas or it just sits at 40 for a decent amount of time rather than continuing to accelerate. It is not throwing any codes.

My second problem is that it used to be VERY loud and had a strong powerful sound, as time has passed it has begun to not be so loud. Im very upset about that since i spent lots of money for the cams and X pipe and bassini pipes. Is there a reason this is happening? or somehow I can make it louder again?

Problem 3, at approximately 60 miles per hour it begins to "wallop" could this be due to a slightly bent rim? or what? I have put a lot of time and money into this car because it is my dream car, i am about to leave for the U.S. Coast Guard and would like to have these things fixed before getting on to base. Thank you for any advice you may have!!
 

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Have you checked these things?
1.cleaned the throttle body.
2.cleaned the MAF sensor.
3.changed your spark plugs.
4.changed your fuel filter.
 

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Discussion Starter #3
Cleaned the Throttle Body, Replaced the Cold air intake filter, The MAF sensor, and the fuel filter, and the spark plugs. Its almost like the car is missing a gear, but I'm not quite sure.. it gets to a certain speed and instead of continuing to accelerate it just plateaus..
 

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I have a 2005 mustang GT, let me just start by telling you mods I have done.
Cold air intake, 4:10 gear ratio, steeda underdrive pulleys, comp cams (slight lope), kooks long tube headers, High flow catted X pipe, and bassini axle back exhaust, as well as a tune from bama custom tuning. Right now I'm running my 93 race tune, I am having a problem with my car when I take off at around 40 miles per hour it seems to "bog" down. It doesnt stop, but it seems as though I have to push harder on the gas or it just sits at 40 for a decent amount of time rather than continuing to accelerate. It is not throwing any codes.

My second problem is that it used to be VERY loud and had a strong powerful sound, as time has passed it has begun to not be so loud. Im very upset about that since i spent lots of money for the cams and X pipe and bassini pipes. Is there a reason this is happening? or somehow I can make it louder again?

Problem 3, at approximately 60 miles per hour it begins to "wallop" could this be due to a slightly bent rim? or what? I have put a lot of time and money into this car because it is my dream car, i am about to leave for the U.S. Coast Guard and would like to have these things fixed before getting on to base. Thank you for any advice you may have!!
Have you checked these things?
1.cleaned the throttle body.
2.cleaned the MAF sensor.
3.changed your spark plugs.
4.changed your fuel filter.
^ This was going to be my first suggestion. Since you already tackled majority of these, we can definitely look into the tune for you! We send out thousands of tunes and build them all from the ground up for your PCM code and your mods. They're not just "canned" tunes, they're built custom by our team, so every once in a while it's possible we mess one up! We'll definitely get it straightened out for you, though if this is the case! Give one of our Bama Tuning Specialists a call and they'll work with you to figure out exactly what's going on.

Our Bama Performance tuning specialists are here in the building Monday-Friday from 9AM-5:30PM EST and Saturday 9AM-5:30PM EST. You can hit them up directly at 888.226.9764 and they'll get you squared away!

-Dan
 

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See if this helps with problem 1.

1- Reflash the ECU by disconnecting the battery's negative cable for 30 minutes.
2- Reconnect the battery cable.
3- Turn the key to the 'ON' position so all of the dashboard lights illuminate, and the chime starts(Do not start the engine).
4- Wait for the chime to stop.
5- Turn off all electrical accessories.
6- Press the gas pedal all the way down in one smooth motion while counting to 5 (1001, 1002....).
7- Slowly release the gas pedal while counting to 5.
8- Wait 6 seconds.
9- Turn key to 'OFF'.
10- Wait 6 seconds.
11- Repeat steps 3-10 twice more.
(Note: The idle may be erratic whenever the battery is disconnected, because the ECU has to re-learn the idle
strategy. 20-50 miles of driving should return the idle back to normal. There's also a procedure in the battery
maintenance section of the owner's manual that facilitates the idle re-learning process.)
 

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I'm thinking clogged catalytic converter. If you have any
 

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Hey Jake. Do you have any progress report for us? Did you get with Bama to help with some diagnosis? That would be a good start. S197 might be onto something with the clogged cats theory. Some of us are fallowing this in case we have the same problem down the road. Good luck.
 

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What a bummer!!
After scouring the internet for what seems like an eternity, the only post that resembles my long standing issue has no printed solution.
I take it there is no way of finding out what was the outcome?

John
 

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Is it possible this might be a problem with intake butterflys not operating properly?
 

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Hi Bud,
There may have been but I guess we'll never know!
I've done all of the above to no avail.
The search for an answer continues though.
 

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Have you checked your fuel pump yet?
 
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