ok i just upgraded to an msd coil and wires....i had their box and iut worked fine on the factory coil adn wires.....i put the msd stuff on and the car had a bad miss so i took it to the shop and had the plugs replaced with the ngks....it had foued some plugs due to the wires not being connected fully.....so it drove fine for a day or so, now it is driving funny again liek it has a misfire...it will start to pull like its stock...then all of a sudden all the extra power will kick in and then turn right back off and go back to stock like performance kinda crazy...very intermittent...im thinking my opti may be bad....anyone else otu there have ideas???

 

We need some more info like mods done, year of car, tranny to help everybody understand your situation a little better.

Dan

 

It is a 95 z28 convertible with a 383 stroker...scat assembly 11.5:1 compression lt4 hot cam...and stage 1 ported lt1 heads...minor computer tune to get it to run correct...msd digital 6 box....msd blaster coild and super conductor wires...jba shorty headers magnaflow muffler....mcleod clutch...k&n intake...ported MAF no screen...HOWEVER i figured out the problem.....with the larger wires i didnt secure them properly and one caught in the serpentine belt and shredded it nicely....im guessing this is my problem...will replace tomorrow and update then...