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Idling/RPM question
So I was reading a thread over in the TSB section re: idling and I did notice something recently - a few times while I'm just idling [this past Friday - left the car on for about 15 mins while waiting to pick up the g/f from the airport] and I noticed a couple of times the engine would drop from it's customary 700-600 range and dip just below 500 then come back up.
Is this anything to be concerned about? As I've never owned a car with this kind of engine, etc just want to make sure there's nothing worrisome about this behavior. It's not super common, just happens here and there when I'm idling [happened at a stoplight for example] and beyond that, no other issues; car isn't stalling, no strange noises or knocking and still no crickets.
So, should I be worried? >.>
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