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I would suspect a possible exhaust restriction, or the valve is opening more than it should ,but I do not know for sure until some checks are done.
Maybe someone has come across and knows the answer.
I would suspect a possible exhaust restriction, or the valve is opening more than it should ,but I do not know for sure until some checks are done.
Maybe someone has come across and knows the answer.
Talking to one of my local mechanics, he believes it is either a plugged intake line or bad vacuum to the valve.