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If your car idles high acts like its going to die at a stop light shifts on own what could it be?

Possible causes:

- Vacuum leak

- Idle Air Control (IAC) valve needs cleaning

- Throttle Position Sensor (TPS) adjustment needs adjusting

- Fuel injector needs cleaning

- Oxygen sensor needs replacing

- Transmission shift solenoid issue

- Transmission fluid issue

- Faulty ECU or TCM(engine/transmission control units)