well i have a 90 Z32 and im have spark issue on cylinders 2 and 4, originally i thought it was bad injectors so i replaced them, still ran like ****, so i decided to do a spark check and of course no spark on those two cylinders, i already swapped the PTU and i do have an other ECU im going to try out soon, and im going to eliminate the sub harness on the PTU tomorrow by soldering the ends together, any other ideas to fix this problem, also i heard you can test its your ECU by testing the voltage on the middle pin on the coil pack connectors and if it shows under 12v its a bad ECU, is that right?