sidwyz

i beating my head against a wall.engine is obd1 355 lt1 so far, i changed the icm for a acdelco unit. have an accel coil showing 6.9k ohms. also have a series 2 msd opti with screw adjusted 2.5 turns from tight. engine also has cc 503 lt4 springs, hardened rods, 28# injectors and a mail order tune.

after my tune the car ran great! i drove the hell out of it. i noticed a difference at around 6k rpm. and a very small amount of valve train noise at starrt up, then would go away so for good measure i adjusted my rockers. well then after a few days it started missing after 5k rpm. then blowing black smoke at start up. then a horrible idle...then nothing.

as i mentioned i have 6.9k ohms on the coil. i have proper power and ground to opti, coil, and icm. i am also receiving a varied signal from the pcm which is only 1 year old. also have switched power to both pink and orange wires in the harness. i know one is supposed to be constant, and i will get to that when it starts. because it ran fine for 3 months with the power set up this way. i also have an external walbro 255 that is lower than my sump from my tank. and the filter is the fram race canister deal, that is before my pump. i also have a gauge at the rail that shows a solid 45 psi at KOEO. i also have new 10.3 mm plug wires and ngk tr55 plugs that i installed in February.

I have to get this car together by thursday...its my only transportation at this point, so my family is depending on it. anyone that has time to help me i would appreciate it more than i could explain.

shoebox

So, do you have spark at the coil wire or plugs?