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It sounds like you have a bad tps.(throttle positioning sensor) it tells the onboard computer how far you have your foot on the accelerator. its like the volume control knob on a radio.after repeated use it gets scratched inside and starts to send a bad signal to the onboard computer. the computer is doing what it is being told. unfortunately in your case it is the wrong signal.Next is the fuel filter,and the fuel pressure regulator. this 2 items will also make up and down abnormal idle.one more possobility is dirty fuel injectors. dump some fuel injector cleaner or get a professinal injector service clean at a repair station.

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18y ago
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Q: What would cause your 1996 Nissan Pickup to accelerate abnormally slow then shoot off to normal acceleration?
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