Hi , I had a 1989 vette that the" IAC "just quit . I replaced the manual short throttle valve adjustment screw with a longer screw an fixed it. Three years ago My "fuel pressure regulator" on my chevy truck slowly went bad an caused the same problem . They all had the same simptons , but were different problems . My thoughts Lovvorn

 

I agree with TNech, You noted that the auto store was out of stock for the IAC motor. And if your transmission codes are not active,clear the codes and see which ones come back.

 

Yeah alot of times that code in the trans ends up being something stupid like "Battery Was Disconnected"

 

Thanks guys for the tips and info. I have ordered the IAC from Advance Auto parts and should arrive anyday. It was over $100 but with the big40 code, it was around $65 shipped.

Also, the CEL went off by itself so maybe the trans codes cleared themselves.

I'll update here after I replace the part.

 

It's snowing again here in Michigan but I had the chance to bring the van into the garage and replace the IAC. I've driven the van for over a week and NO MORE STALLING!! I notice now when I let off the gas to coast that the rpms drop slowly now and settle at around 8-900.

Just want to thank all the knowledgeable folks, especially TNTech who said replace the IAC and mastertech who agreed. If the parts store would have had that in stock the first time, I could have saved some bucks. But I still came out lots cheaper than going to the repair shop.

 

HAHA. It's snowing again in Tennessee too!!