So i just did my swap this weekend i decided to upraged since my 305 had a blow head gasket and bad piston rings and I went to the 350. Now my car when turning it on cold is idling very rough and shaky at about 500 rpm's and when I shift into drive it will stall out, also it will stall out at stop lights. Once i warm up to about 200 degrees though it seems to run just fine but it still idles pretty rough any suggestions I am not very mechanically inclined so please make it as barney abc style as you can car talk to me is like me descrive the entire function of the cardiac system lol its just another language.

 

forgot to mention its a 92 TBI iroc-z

 

no such thing as a 92 iroc-z. iroc z stopped being produced in 90. if u have a z28 it should have tpi not tbi if i m not mistaken (not as knowledgableabout fbodies as gbodies).

 

damaged coolant temp sensor. or flat out your timing isnt correct.

 

well who cares fact is its a TBI and it has a 350 lol the ***** stalling and i dont know why

 

most people are telling me to start with the iac valve