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Thanks for the info--that definitely helps. I replaced the coil packs and the P0300 code has cleared. I still get the P0421 code, so I'm going to look at the exhaust options listed above. One down, one to go.....

The plugs and wires were changed 20,000 miles ago. I haven't done the coils yet--just wanted to make sure that may fix the problem before I began randomly replacing parts. I'll look into that, and I have used a non-fouler on another car. I'll see how the coils go, then work with the...

I have seen several posts here and around the web about these check engine codes, and would like a little more information. First, some background on my car. It is a 2002 Protege 5 with 130,000 miles. I was driving approximately 40mph and my car misfired and sputtered. The check engine light...