After checking all the connectors. Id check resistance on each coil pack then each injector. If all ok pull cas out turn ingition on(no starting it) turn the shaft of the cas and ull hear as your turning each injector will click check em. Quick to check and eliminates three major things. Then time it with a light. If u dont have the tools to do ot runa self diagostic test. All u need for that is a 10mm socket and a flat screw driver. So not bad. Good luck with it!