i did h/c/i swap and longtube headers. my ses light came on after startin it and drivin it a lil bit. i also got a mail order tune done and the rear o2's deleted but when i hooked it up accidently plugged them in to rear connections so i switched them and the ses light still stayed on and autozone pulled the codes which still said both 02 sensors no reading. and something about low voltage to o2 sensors. any ideas? also they pulled a code like p0507 i think which is high idle. for some reason the car(m6) when i let off gas and push in clutch the rpms sit a lil about 2000 rpm and dont go down unless im stopped sittin at idle. anyone know what the problem is? Thanks