Q: When I hit 40 mph my gas pedal starts to shake hard, what could this be? Thank you . deidra9630@gmail.com... ive been to 7 places

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My brakes were just done in the front, pads and rotors. But the issue of the gas pedal shaking has occured and ive been to 7 different places hearing different things. What could this be? I have children and get scared even driving to work not knowing if something is going to bust off while driving. One mechanic said half shaft.

My car has 26000 miles.
My car has an automatic transmission.

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