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Engine idle problems

(1999 Ford F-150)
in Tampa, FL on May 28, 2011
why does my engine rev up and down at stop lights?
Displaying 1 answers & 0 comments
Popular Answer
on May 28, 2011
Could be a sticking idle air control valve. Could be a vacuum leak - check for disconnected lines under the hood and for any signs of leakage.
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