chevey optera 2008 accerlation is not working car slows down till stop but enginge stays on
A 2008 Chevrolet optera ls Automatic transmission . IT starts with hi idle (not normal).
when car is moving then suddenly an over run of the engine (as if the peddle is pressed hard) . the peddle still accelerates the engine but no power and the car slows down to halt the shaft is still on the D position . To move on again the car must be switched off and turned on again. And the same thing takes place again and again .
The obd2 gave tps switches so we replaced the throttle completely. Is it an engine or automatic transmission failure ???? appreciate any help