po300 Blues Goneeeeeee. after reading (search po300 infor.)
went back ck every thing ,fuel pres. coil, ect. cking distcap and rotor got new in dec. from autozone looked fine as far as i could see. i still had my old cap and rotor, so i look at the two side buy side. the gm one was heaver and maded of a diffent kind of sutff.so for some reason i cleaned the gm cap and rotor up with carp cleaner and sand paper put it in. blazer runs great. delete code no engine lite yet been 24 hours now. going to get all my parts from the gm dealer from now on.
po300 bules gone for now thanks to all .