Car : 94 silverado 5.7L

Problem : Car idles fine till it's warmed up. RPM fluctuates but car runs fine it's only the idle problem that's bugging me. I changed EGR valve and PCV valve. Car had some work done on engine and maybe carburetor before this started to happen but it could be something else. Tell me what to check and i'll do it and get back to you.

 

HAve you cleaned the IAC yet? Have you tested your TPS?

Maybe all you need to do is clean out the throttle body and the port the iac goes into and your problem may be solved..

 

I have a new IAC on my car but never thought about testing the TPS. I'll do that and see if it's the problem.

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Thanks for replying i really appreciate it