when i start the motor in the morning it idles rough till i hold down on the gas on 1991 Chevrolet S10

it has been doing it more often it idles really rough step on gas a little then it will idele better runs really good just does it after it sits awhile or over night

by in Richmond, VA on April 08, 2012
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1 answer
ANSWER by , April 09, 2012
you may have carbon build up in throttle body or idle air control valve is bad