So for awhile now my car has been acting weird. Ive made previous post about this but this is kind of an update and I need help again. When I'm driving my car and I come to a stop I'll push the clutch in and it will drop low in rpm's sometimes like 500-600, sometimes really low like 100 and then sometimes it will cut off. I have replaced the manifold which I thought was the problem since there was a crack. That didn't help, in fact I feel like it runs worse now, its a Dorman intake from advance auto. I would've got the FR but it was a Christmas present. I've replaced the IAC and TPS, also changed the fuel filter. The car also has service engine light on and last time I ran the codes there was like 8 or so, so I checked all the fuses and found nothing wrong with them. I gotta go to advance tomorrow and get the codes again so I can look them up. This could be the problem but I don't know.

I'm stumped and don't know what to do from here, I would put it in the shop but I feel like they are just gonna check everything Ive already checked.

Honestly with 8 outstanding DTC codes, any advice would be pointless (other than post the codes).

But in the interests of helping, check the fuses again.

https://www.allfordmustangs.com/forum...1.html#2669271

Make sure the battery holds a charge and that the battery terminals are clean and tight.

Here's some more information on how to trouble shoot IAC/idle issues:

https://www.allfordmustangs.com/forum...9.html#2260649

For low idle start by looking for:

• Vacuum leak between the MAF and TB butterfly.
• poor cylinder balance. IE one or more cylinders not pulling their weight relative to the others.
• Bad IAC

IMO, the Dorman intake is not the problem (assuming it has been installed correctly). The Dorman is a serviceable part for stock street use.

What brand of IAC did you buy? Should buy motorcraft lots of people have had problems with generic brands.

Like mentioned above, start with posting the dtc's once you get them and we'll go from there.

Usually in situations where there are multiple faults, it generally can be traced back to one fault that is triggering the others.

I got the IAC from advance auto, about a year ago I guess and I don't remember if it was a Delphi or BWD, I'm thinking its a Delphi.

I had the code ran today luckily there are no longer 8 codes it's only 1 now, P0113 High intake temp I believe. Also the car didn't cut off or even drop in rpm's while driving but it did drop in rpm's when I started it up each time, it also seemed to be hesitating while driving. It felt like it was sorta jumping, not bouncing but kinda like jumping forward as if I were tapping the gas, it wasn't very noticeable so I idk what that was all about.

P0113, "high intake temp", eh? I'll do some looking around on that one.

Since you have an '00, the IAT sensor is not integrated with the MAF like on '02+ cars. First thing I would check is that it is oriented correctly and is not sideways in the path of airflow. If you have an aftermarket cai installed it's a good possibility it's not getting a good reading because of not facing the correct direction. Also inspect the little bit of exposed wiring that is there, make sure it doesn't look to be damaged or shorting/grounding out on something.

See if any of this helps....

OBD-II Trouble Code: P0113 Intake Air Temperature Circuit High Input

Alright i'll mess around with it, get back to ya later.

In case anyone is watching this thread, I figured out the problem. The connection somehow came unhooked or maybe I just forgot to plug it in. Car will still drop in rpms but it hasnt cut off on me yet so that good. It also wont drop low in rpms when I rev it up just sitting so thats good too.

Cool, thanks for posting. So it was the IAT was unplugged? Might take a couple drive cycles for everything to smooth back out to normal.