When I press the gas pedal, my car will not go.
If the vehicle is in drive and the vehicle won't accelerate there can be multiple issues causing this concern. The transmission could be slipping not allowing the flow of power from the motor to reach the wheels. There could be mechanical issues in the transmission or the differential that are not allowing your car to move. If you mean your car won't accelerate efficiently, there could be a few drivability issues causing this such as a misfiring motor not having power. In either case, a diagnostic should be performed by a qualified technician to pinpoint your acceleration issue.
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