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Wires don't just go bad overnight, that cant be it...
as for CAT i was thinking the same thing when he said smell...but with the shake he is describing i would definitely say misfire, which easiest way to cause a misfire overnight...Frozen gas, which means theres too much water in it...therefore bad gas...so top it off and add injector cleaner, i personally would drain the old crap, but its not 100% necessary i guess...
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