2005 colbalt 2.2 One day car just started running really bad. Then it wouldn't start. Had a tune up done, and replaced fuel pump. Now car is still running badly and the exhaust pipe around the cat is red hot. Also throwing a p300 code. Appears cylinder 2 is not firing, would this cause the hot exhaust pipe?
P0300 is multiple misfire, but like the other guys are saying your cat is plugged. You will need a new one.
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