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    Reving on its own. need help.

    This is my first supra that i have owned. Its a 1986.5, one day its just started reving from 1200 rpm to 2000 and back down. I have changed out all vac. lines, head gasket, and TPS. and the car still revs on it own. My next step is to change out my EGR valve. Dose anyone have any other ideas on...
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