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TPS will also do this, sometimes it will lose the zero reference and need to be reset. Turn key on/off three times for ECM to set TPS reference to zero with throttle closed.
Mine would do this after running highway speeds for awhile, I would have to hold throttle open a hair to keep it running.
I have also used a radio tuner cleaner/lubricant on the rotating part of the sensor with good results. Better than $55.00 for a new one.
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