Quote:
Originally Posted by S4NoMore
With the AC compressor on, the engine idles with a bit more power (slight air/fuel adjustments via the ECM) to compensate for the additional load, hence why this behavior doesn't occur with AC on.
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Somebody also mentioned the turning of the steering wheel causes the RPM to go higher. So this would probably be the ECM adjusting for the additional load of the rack and pinion power steering. As the pump sends the hydraulic fluid (steering fluid) to either side of the rack piston.
So many things this can be. Throttle body related issues can cause this symptom. However, it just might be the ECM adjusting and overtime it adjusts itself to the additional loads etc and smoothes out. ??? Good luck!