I hope this is the correct place to post this question. I have an '85 Z28 with a 5.7 TPI. When I first start it up it wants to idle at 1500 for about a minute then it will slowly idle down and then jump around a little before it finds its calm.

Also, I notice that when I first start it up and the engine is still cold (meaning the temp. gauge hasn't moved at all yet) I step on the gas and it wants to stumble and hesitate before taking off. What would anyone recommend? Thanks

 

Replace IAC, clean throttle body good, recal the TPS. before jumping into it check for codes first, check IAC counts at Idle should be 30-50 or so too.

 

Can you send or post TPS recal. instructions. Maybe there is a link.

 

You will find everything you need to know in the technical article section thats on the home page of this site.

Also, do a search, you will find more than you ever bargain for!!!!