I've noticed that after driving at highway speed (2200-2300rpm's) and I'm coming up too the light the engine rpm's start coming down to around 1100-1200rpm's then when it drops too idle, the rpm's will drop too just above 500rpm's then kick back up. I've noticed this only after getting off the interstate, driving around town the idle doesn't do that, what are some things I need to check into???
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