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I got a 99 gt i just bought... Today i filled up with regular chevron gas and when i got on the highway my check engine light started flashing... it was on already for p1151 lack of 02 switches- bank 2 sensor. Now it has another code p0304 cylinder misfire detected- cylinder number 4.... Autozone gave me alot of reasons. I just wanted to know where should i start fand the most likely thing that could be wrong with it