well JR I put two new O2s in and just deleted the rears and also checked the fuel filter and it was plugged so bad I couldn't even blow through it. I changed that also. I drove it for quite a while with several WOT runs and NO CODES!!! The only thing I noticed was that it still has some knock retard. I though maybe it was doing it at first because I just flashed the tune in to it. It did seem the longer I drove it the less knock it had. The tune is stock other than the fans and O delete and egr. I also hear that 98 had false knock so maybe that's my problem