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well my car would do that once in a while but i would just tap the gas pedal and it would go back to normal idle.
check the throttle cables and make sure nothing is hard. (move them with ur hand back and forth)
make sure the idle air control valve is plugged in right the tps too. maybe the plugs loose or something.
make sire that nothing on the intake manifold (vac lines) are loose or rotten.
hope you can figgure it out.
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