[shanes0406]

Im restoring a 1968 mustang coupe and im trying to figure out all the kinks. I have checked the points and timming and even the inline fule filters, everytime i gently apply pressure to the accelerator pedal, the engine feels like its flooding and starts bouncing all around. as i continue to apply more presure it revs up perfectly normal. little pressure almost stalls- more pressure runs like a champ...

Any advice for a newby?

[429ragtop]

give us some more details

[shanes0406]

It has a holley 500 carb... its timing runs very smooth at about 10 degrees... Example if i was at a stop light and wasnt in a hurry and i casually accelerated it feels like it will stall untill i actually get rolling to like 7-8 Mph.... then i can give it as much or as little gas and it runs and revs fine. it feels like i almost kill the engine everytime i go to accelerate except if i punch the gas

[cindys_sn95]

try pulling the timing up a couple of degrees and see how it does. 12 maybe even 14.

[shanes0406]

is that to much? i dont know what the maximum degree i can turn it too... i just dont want to move it to much....

[Jonk67]

Check all your vacuum lines/sources for old hoses/leaks around the intake, carb. mounting gasket, PCV hose/valve, etc. Vacuum leaks are more pronounced at low RPM. I think you're going to have to diagnose one system at a time and test drive as your symptoms could be vacuum, timing, carb. adjustment, etc.
Jon

[429ragtop]

Originally Posted by cindys_sn95

try pulling the timing up a couple of degrees and see how it does. 12 maybe even 14.

This dosent sound like a timing issue. Sounds to me like your carb air fuel mixture is off. Have you checked to make sure they are properly adjusted and equal?. Also, will the engine do this if you run it in park and slowly raise the rpm?

[redrocket93]

do you run premium gas when i ran regular gas in my 68 it did the same thing but when i ran premium it was ok

[Print Dad]

Hello shanes0406,
Gotta agree with 429 ragtop on this. I also don't think it is a timing issue.
Just so you know however, if you advance the timing too much, the engine will be hard to crank when warm.

I would check for a vac leak. You could also spray a little carb cleaner at and around the base of the carb while the motor is running. The motor will speed up if there is a vac leak.

I am thinking carb out of adjustment. It is also possible that the accelerator pump adjusting screw is not set right. You can check the Holley site for specs on how to adjust this screw. Many people think you just turn it in until the head of the screw hits but that is not correct.

Start with these simple things first:
1. - Check for vac leaks
2. - Adjust air mixture screws
3. - Check accelerator pump screw it is in the purple circle. Sorry if you knew this

Post Back and fill us in on what you find or don't find so we can help.


Print Dad

[doobie]

Sounds similar to an issue I had after installing a bigger cam in my 289. I have an automatic and the stock torque converter was no good for the bigger cam. Installing a slightly higher than stock stall torque converter solved the problem.

[tbunker]

Originally Posted by Print Dad

Hello shanes0406,
I would check for a vac leak. You could also spray a little carb cleaner at and around the base of the carb while the motor is running. The motor will speed up if there is a vac leak.
Print Dad

Maybe try using WD-40 instead of the carb cleaner. Carb cleaner can strip the paint off your engine. You spray the WD-40 around the potential leak areas. If there is a leak the WD-40 will make your engine run slower (I believe).