Engine Idle problems on cold start, Need help

[rctrooper1]

Hey All,

I am having problems with a cold engine start idle. I read here one of the problems could be the Idle Air Control (IAC) valve. I have switched it and install a new one and the problem still occurs. I do not get and "check engine lights" and have verified that the check engine light is working fine.

Any suggestiongs, where to go from here? The car starts at high idle and then goes low, high, low and at times it dies on very low idle. The problem goes away once the engine is up and running at normal operating temps.

Thanks in advance,

jz.

 

[kidglok]

what is the iac reading when this happens?

 

[rctrooper1]

I do not have a scanmaster, so I do not know what reading it has. Is there anything else I can do?