i know a million people ask about what plugs...but im down to my last option. my car has ported S/C with 3.4, SLP headers with custom 3 inch down and 2.5 out the back, dhp pcm, msd and stock coils, and autolite 104s. ive been throwing a code for multiple misfires. since the first time ive replaces coils and plugs, checked all wires and made sure all connections were tight and clean. i threw the code again tonight. it only happens when "racing" or heavy load persay. can anyone lead me in another direction or suggest something.
