theres a part mounted below throttle body which needs cleaning from time to time.Mine bumps 300 rpm when cold only.Even in Drive.I also hear that the wires inside the throttle body can have its insulation crack,and these wires touch and can cause idle bounce.They sooner or later need new wires. I can't see my idle controller under throttle body so for now I let it alone.Probably a shot of throttle body spray at the right place would clean the gunk.

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1999 w140, quit voting to old, and to old to fight, a god damned veteran, deutschland deutschland uber alles uber alles in der welt