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a bad TPS, TPS is getting wrong voltage, throttle plate is gummed up and sticking, IACV is gummed up, sticking or improperly adjusted, improper plug gap, dirty MAFS, bad knock sensor, improper torque around intake manifold nuts, bad/rotten intake manifold gasket, timing is off, a vacuum leak you missed somewhere on the motor (especially BEHIND the engine on the vacuum routing plate)
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