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i posted earlier about an engine stumble at beginning of accelerating. I have a new symptom. in neutral I cannot control the engine rpm below 1500rpm. engine idles at 650 and any movement of throttle the rpm goes to 1500, from 1500 up I can hold the rpm. according to cheap scanner the...

hello, I'm new to the forum. my son's 2010 with manual transmission has a stumble at the beginning of a shift . it's worse at lower speeds. power feels good at high end of rpm. 80,000 miles with brand new spark plugs ( thought that might be the problem ) and a new egr valve which was...