Q: Q: RPMs idling low.

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When I start up the car, the RPMs drop down low. And when at a stop the RPMs just idle up and down. The car has over 108,000 miles on it, and I didn't replace the spark plugs at 105,000. When it stalled on me three months ago, the dealer replaced the battery, ECU, and the alternator. What can be the problem?

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