Engine accelerates on it's own

Asked by Apr 09, 2015 at 06:33 PM about the 1996 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

1 Answer

102,005

TPS could have an intermittent cross circuit or the ISC is damaged and is sliding around causing an unstable condition in the idle ports, if the ISC valve is fully open it can run the engine up to 2000 RPM.

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