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Test the tps by backprobing it with a T-pin. Set your meter to the dc volts scale, key on engine off, backprobe cavity C of the TPS (grey wire) you should have approx 5 volts. Backprobe cavity B dark blue wire and with the throttle closed you should see approx .5V - now slowly open the throttle and the voltage should steadily increase with no glitches all the way to approx 4.5V If there are any glitches replace the TPS.