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2008 Grand Cherokee has the code P0456. Replaced the gas cap. Did a smoke test and the only smoke that could be seen was coming out of the throttle body. It was getting completely through the system because when pulling the gas cap, the smoke came out. Recently, I have issues filling up, not all the time, but sometimes when I go to fill up it will keep stopping the pump, not sure if this is related. Jeep idles rough, but doesn’t stall.
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