hi purchased a 2003 z with 120k miles it is in pretty good condition (focusing in on the tranny problems and etc.) but today my car throws a SESL and i brought it to my friends shop. The night before i drove it it low idles and stalls out so i assume (maf or throttle body) so i bring it there to relearn it and my car now idles from the nromal 650-750 RPM to now 1000 Constant and its throwing two codes! P0507 and P0304 I know what both of these codes mean. But my question is now why my car wont relearn again ?? it always says incomplete. Is it because of my misfire on cylinder four that prevents my car from restoring..?