Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
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the most common issue for the 300 miss fire code is fuel pressure too low. it needs to be checked to verify. you can rent a tester at a parts store is you do not have one.
the gas in the oil may also indicate that an injector may be leaking and dripping into the oil.
first, I would check the fuel pressure