88stang5.0

Ok i decided to go ahead and change the spark plug wire then i got to drive it and it is misfiring like crazy. ok stop check the wires and see if i put them out of order. ok they are fine . so then i went and changed the spark plugs and it still is doing it. I am lost i have a new msd blaster coil, new cap and rotor, new wires and new spark plugs as well as the ignition module all is brand new. and it is running like there is a cylinder out. any ideas on how to fix this or what might be wrong?

88stang5.0

by the way it has new gt-40p heads all new valves new springs ect... all vlavetrain is about 1000 mile on it. and all new rings as well. so it has good compression. it was also misfiring a little before i changed the wires. just not as bad.

EmptyEvergreen

personally i would go back and double check the plug wires first, from there i would make sure that everything is set up correctly, make sure you didnt miss any details or if you overlooked anything, most of the time in situations like this when you figure it out it is always something stupid that you carelessly overlooked, at least for me that is

gmkilla

had a similar problem, backed my timing way off...runs like a dream.

88stang5.0

ok i am guessing it is something stupid but i was bout ready to drive my car into a wall last night after spending a 100 and like 3 hrs and it got worse. had to just cool off so i am going to check it all today. thnx

88stang5.0

ok checked all of it and still nothing is wrong that i can see. i know the timing isnt the reason so i am lost! any one have any other suggestion? another thing is the msd blaster coil to strong for the cap and rotor if it isnt msd? i dont think so but there are little burn marks on the rotor and cap and it is about a month old. so i put the stock 1 back on just in case but i dont think it matters.