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

 

Hi, welcome. On your misfire check your COP and the plug on that cylinder. Are you running the MIl setup or do you have O2 sensors?

 

It has co2... i replaced 2 of them and a whole tune up with new coils and its running fine now... thanks for your input though

 

glad to see you figured it out.

 

Glad to see this.Nice stuff.Keep on updating .I really like this sharing that is tune up with new coils and its running fine .