Hey man, thank you for the detailed explanation regarding grounding. I have developed my own ECU from scratch and also wrote firmware for it. I have run 4 cylinders very well, 6 cylinders too with no problems. I have installed the same ECU on a V8 and for some reason, there's interefence that I can't comprehend where it's from. If I use the same harness on a 4 cylinder but attach the other 4 COPs with grounded spark plugs and also attach 4 extra fuel injectors to mimic a V8, the 4 cylinder runs very smooth. No hiccups, revs pretty fast to red line and has power throughout. I check my data log and it is very clean. As soon as I put back the whole harness to the V8, I have hiccups. Engine never stalls but can feel the hiccups, from time to time. The engine has tonnes of power but I'm working on clearing that hiccup. I'll change the plugs to the ones that match with the COPs I'm using and observe if it wil help at all.
What if I turn all ignition leads, distributor and ignition coils into a "coax" configuration, thus providing a straight current return path not through the strap but through the external copper brading?
