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I meant temperature change in your motor represented by coolant. Once it’s warmed up it doesn’t need the bump in idle.
Another clue in the mystery. Every time I shift there’s rev hang and the exhaust sounds louder. RPM rises for a sec after I Lift off throttle to shift and sounds like a deep rumble. Any ideas on this? Similar symptoms on an unrelated car stated the same things here, IACV TPS and the throttle cable. Any thoughts on that?
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