After highway driving when coming to a stop, the engine idles high (1100-1200 RPM) after highway driving. After 15 minutes of city driving, the engine revs become back to normal .. hrm. do you guys know why this might be happening? Would I need to clean out the throttle body, or would there be a vacuum leak somewhere around the engine.. hrm..
A vacuum leak would not go away after a few miles of city driving...sounds like a throttle body cleaning is in order with special empathsis on the IAC valve passage.
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Make sure you spray the IAC itself too. Mine was all gunked up on the spring and it was sticking alittle. While your at it clean out the EGR.
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