unusual engine idle

Mtssurf1

New member
occasionally when I go to turn on my runner from a COLD start, important that its stated that its a cold start, sometimes the engine revs bob up & down from 550 to around 800. Its an automatic if that matters. If I keep my foot lightly on the gas for a few seconds to bring the revs to around 1200 for just about 10 seconds once I let off the gas the engine will be at a constant idle.
I have done the ISR mod and a flowmaster muffler that has less constrain then the stock muffler. Both of these mods have reduced my idle when its warmed up. I hope y'all can help me diagnose the problem. Once again to clarify the Weird idle only happens with a cold engine.
Thanks for the response's, -Matt
 
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Have you tried cleaning the IAC valve? That's probably the first thing I would try. Maybe it gets a little jammed when cold?

Good luck
 

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