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Idols high,goes down a little after it warms up

(1990 Chevrolet 1500 Pickup)
in Salem, OR on December 20, 2011
truck run very good except the idol wont go down,is there a senor?
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Popular Answer
on December 20, 2011
Yes, 2 of them, check your water temp sensor & the IAT (idle air control) sensor in the throttlebody both of these can cause an eratic or high or even both
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