i have a 95 z28 lt1 auto. heres the mods-wieseco 11.3-1 forged pistons, comp camdur@.050 230 244 lift510 540, bbk 58mm TB, mild porting and polishing on heads,svo 32lb injectors, comp roller rockers,bbk shorty headers,hypertech 160 therm, tuning done ny ed wright from tulsa,OK, tci 3000stall, 4.10 gears M/T ET streets on back . was running 12.83 1/4 with 3.43 gears. changed gears and started running 13.0 check engine light was comming on and off had checked codes 43 knock sensor circiut prob, and 64 right O2 faulty. was fauling plugs. changed O2 wiggled knock plug new plugs ran 13.8 @ 97mph i cant figure it out should be low 12's i would think pulled plugs now they all looked lean running 105 unleaded any help appreciated