On the throttle body were the air filter hose attaches to there is a TPS sensor installed on the side of it. It has three wires coming from it. One is a ground and the other two are the hi and low sides to the reostat built into it. The reostat is like a grid in a toaster you can say with an arm that touches the grid. As you push on the gas pedal this arm inside of the TPS goes to a higher position the further you push the gas pedal down. In time the grid gets worn and crusty inside that will cause a short at any given area of the grid. It will normally happen at the very low end and other spots were the arm lays at most of the time. This will cause the engine to die out although it will restart at most times. Someday it will not start for the grid will finally break causing an open to the circuit giving no signal to the computer.
This part can be purchased at most auto parts stores and any GM dealer. You will need to set the voltage to 1.5 volts when setting this at the idle position
'Godd luck to you
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