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What would cause the engine to idle high when started in afternoon?

(2002 Ford Ranger)
in Kernersville, NC on August 25, 2013
Engine idles high around 2,000RPM's when started in afternoon but as soon as put in drive it drops down to 1,000RPM's?
Displaying 1 answers & 2 comments
Popular Answer
on August 25, 2013
After the engine is warm, does it idle ok in park?
on August 26, 2013
Yea once it was up for like a half hour or more.
on August 26, 2013
Suspect idle air control. Scan test needed by a mechanic, not just codes read at parts store.
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