My 92 fox has had complete rebuild with upgrades, heads manifolds, injectors, mass air,throttle body and egr spacer, ect. But the car will not stay running when I first start it, so I rev it up a few times if its warm out and a few few more times when its colder out. the rpms fluctuate but doesn't stall, only untill it gets a little warm. Once the engine is little warm idles great!! Every time. Is it a choke issue? or maybe a timing issue. Running a b303.

 

Is the idle set properly?Where does it idle at once it is warm?
Could also be the IAC.It's usually the typical issue aswell.
Take it off (you might need a new gasket if it rips),get some throttle body cleaner,and spray it out,sometimes that will help,if not,you might need to get a new one.

 

when warm it idles at 800rpm. I have played around with the idle screw a little while its running trying to get it just right.

 

Have you cleanned the IAC?

 

I have never cleaned it, but have had it off. Didn't look all gummed up, but I'm thinkin i should just go ahead and replace it then, being that its sound like a common issue. Thanks!! I'll let you know how it turns out!!!

 

Keep us posted for sure.Good luck.

 

Any news on that issue? I have the same issue with mine. I start it in the morning, and I need to give it gas in order for it not to stall. Once I've reved a couple of times and its idling, it seems like I have a mild cam.
I've removed the IAC and it wasnt the issue. Im thinking its my throttle positioning sensor. When the car runs, I can just disable it and nothing happens. Not sure if that is normal.

 

no news yet. I have been waiting for the car to get out of the paint shop. I doubt its the tps because my issue didn't change when I upgraded the throttlhe body and it came with a new one on it. I hope its the iac as it drives me nut to not be able to just turn the key and walk away. But I'll let yous know here in the spring.