power is directly to battery and so is negative. 3/8 lines. Computer is mounted just above the high beam switch on the floor. I've gone over all connections and grounds 2 or 3 times. The coil is an MSD masterblaster2, and it is was wired correctly. I had the unit professionally installed to make sure that I didn't screw anything up. At this point I'm thinking of taking off the fuel pump to check the filters and check the filter in the tank to make sure it's not gummed up