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2005 Scion tC
When I let off the gas at 35-40 mph my rpms drop below the idle and come back up. So if it idle at 1500 it will drop to 1000 and come back up to 1500 where it should be. Only does it at between these speeds. New egr valve, new throttle body, new spark plugs, new transmission. I’ve had the engine looked over by a shop twice now. Feel like it’s transmission related it is under warranty.
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