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Car idles up and down when cold sometimes dies

(1990 Lincoln Mark VII)
in Menomonee Falls, WI on March 23, 2011
no engine light on cleaned egr and iac checked intake for leaks when car is warm it runs good. but when cold it will not idle and sometimes dies at idle it surges up and down
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Popular Answer
on March 23, 2011
cannot clean the iac motor. replace it and i bet your issue goes away.

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on March 23, 2011
I would suspect the coolant temp sensor that is like the choke for injection systom, not the temp sender for dash gauge or light but will have more wires, weatherpack connector to seal out water and real close to the thermostat housing. Might try unplugging while engine is doing this and see if stops. May need to monitor oxygen sensors also to see if having probs going from open to closed loop, will need to do this with a scanner. Sorry, Roy, did not mean to step on toes. Your response popped up when I posted.
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