2011 jeep liberty 3.7 engine fault code P0300
3 Answers
I'm not sure, but I think that's your purge valve....attached to fuse box with fuel hoses and electrical connection near battery..about a $75.00 part. causes rough idle much like a misfire when it's not working right.
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You may want to do a compression test. Just had same think with a 0200 it dropped the valve seat in the head