Stuble at idle

[Turbotalon92]

I have done about everything I can think off for an off load stumble and am scratching my head as it is still there. New fuel filter, rebuilt injectors, new distr., wires and plugs, tested coolant sensor... not sure where to dig next? It stumbles at idle, cold or hot, drives great under load, cold start is quick and sharp, hot start is a bit slower but not anything crazy long when turning over. Doesn't search for an idle speed like a vacuum leak would cause. Any help is appreciated.



Thoughts?

[Turbotalon92]

Crap "Stumble at idle". Can a mod fix please?

[e30Rooster]

Try a new fuel pressure regulator, worked for me.

Sent from my C771 using Tapatalk 2

[jlevie]

The most common causes of a hesitation or stumble coming off idle are in take leaks, misadjusted or bad TPS, or a worn spot in the AFM's variable resistor.

[Turbotalon92]

It's not coming off idle but at idle. Like a skip but random. Another symptom, maybe related or not is that when its above 85f outside it will stall after extended periods of hwy driving. Takes a few minutes before it will start again. Just turns over if you try to start right away.

[Turbotalon92]

Regardless, I will take a look at the Airflow sensor. Thanks.

[603Racing]

I have a rough idle and a known vacuum leak. Car runs great other than rough idle.