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If your problem is identical to most Saturns where at idle the idle vacillates a couple of hundred RPM and most recently I had an occurrence where the temp gauge would jump along with the tach, your problem is most likely in the temperature sensor located beneath the thermostat. It's an easy fix to replace and takes maybe ten minutes. Disconnect the air intake module at the throttle body and unclip the other end from the air cleaner. Follow the directions in your repair manual and you'll be a happy camper and save about 200 bucks from having a garage do it.

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Q: The motor on your 1999 Saturn sc2 is jumpy in idle how do i fix it?
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