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Hi
My idle around 500 _ 550 at stop while in drive but if i turn headlights on it goes to 620 650 then idles smooth. When i brake goes down little then comes back up. If i turn the ac on goes 750 800 rpm. I clean the throttle body twice. Changed pcv valve. New ground wires. Nothing help.no check engine light for ever. Any idea?
 

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That's interesting. Usually it would be the other way around, Dropping RPM with a load because the idle-up isn't working properly.

Are you losing/burning any oil? maybe low compression or blow-by is causing the RPMs to drop while at an unloaded idle, and when you kick on accessories, the computer is making up the difference with the idle-up response?

This is PURE speculation and it's probably not it...but it's a thought with the 2.4L
 
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