Throttle position sensor sends car into limp mode if you give the car gas(via the gas pedal) when you are also applying brakes. Happens to me on both my Crossfire and my Ram pickup. Limp mode sucks - it can get you run over if it happens in an intersection. The Crossfire only resents after you shut the motor off and restart. Ram is better -it resets automatically after a few seconds. My sensor is bad and it will also send car to limp mode if you put the gas pedal all the way to the floor for a few seconds. I believe the sensor is around $150,