I have a 91 si hatch with a jumped obd1 94 ls. I just recently wired in the injector plugs and removed the resistor box from the obd0 motor and took the gray plug off an obd1 harness. I have no clue what is going on. THe car cranks its getting fuel and spark yet the spark it not consistant could it be the dizzy? I also have An MSD SCI-L box hooked up but could this be installed wrong? does anyone have instructions to hook it up besides the one ont he back of the SCI? I believe it is hooked up right yet i may have the wores in the distributor wrong i bought the box and kit of my boy and it was off and obd2 so i put it on a obd1 could this be the deal? When i go to start the car it cranks then backfires while i crank it over. any help would be great thanks!