Asked in Grand Am GT
Grand Am GT

Why would your 1999 Grand AM GT Accelerate by itself I have to turn my car off in order to get it to stop doing it. I first thought it was because my cruise control is bad but now it does it randomly?

Answer

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Wiki User
11/19/2014

A bad throttle position sensor could cause a 1999 Pontiac Grand Am GT to accelerate on its own. Another possibility is a loose connection at the idle air valve.