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sounds like a bad tps. you can check it yourself if you have a voltmeter. with the ignition turned on, probe the center wire on the tps connector. with the throttle closed there should be 1/2 to 1 volt. with the throttle wide open there should be approx. 5 volts, then slowly open and close the throttle. the readings should be a smooth gain in voltage as the throttle is opened, and vise versa as you close the throttle.
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