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Most likely your throttle plate is dirty and needs to be cleaned That is the first step The next step would be to check your Idle Air Control motor. The third step would be to check your coolant temp sensor as this can cause to rich or lean a condition and mess up your idle

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Q: Why do my rpms drop to 500 or below when I push in the clutch when I am coming to a stop after about a second or so they go back up to my 1000 idle speed?
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