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strange issue with rpm's
on my way back to work (not beating on the car) i pulled up to a traffic light. my foot was not on the accelerator however I heard the engine working. I looked down and the rpms were a bit high. After hovering a little bit over 1,1000 rpms, they would then jump up to +/-1,600 and then back down around 1k. Two seconds later it would jump back up and do the same exact thing again. It did this for a good two minutes before the light turned green and I took off. Strange. Any ideas as to what would cause this?
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