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There are a few different things here that could be the issue ranging from shorted injectors, sensor or even the PCM. Lets begin by monitorign the voltage on the Throttle Position Sensor when it is acting up. At closed throttle it should read 0.5-0.7 volt. If it goes high on the scan tool, monitor the voltage at the TPS. It should read the same as the scan tool. If it reads lower at the TPS, check the input from the cruise control switch at pin 32 of the C3 connector, it should never read over 5 volt. If it does, disconnect the clockspring and see if it comes down. If it does, the clockspring is shorted. his Powertrain Control Module (PCM) may set injector codes if the TPS is erratic. If the cruise control switch circuit gets shorted to B+, the PCM will not interpret the correct voltage for the TPS.