ok i just put a d16y7 in my 91 civic 4 door dx, the wiring for the mpfi swap was done before the swap so i know it cant be wiring.

sometimes when i start it there will be no missfire but a few seconds later it starts, pulled the plug checked for spark looked really weak put it back in no missfire but then again started after a few seconds of running pulled it again now no spark at all. running ngk plugs, replaced the one on cyl 4 with a brand new one didnt help tried a different plug wire no luck there, im still running obd0 with a si dist. with msd cap and blaster ss coil.

any input is appreciated thanks.

 

ttt need help, its actually a cyl. 3 and 4 missfirebut if i pull the plug out and ground while cars running there will be random times it sparks but not consistant.