Well, I was setting the timing a few nights ago and I noticed a unmistakable snapping sound, so I turned out all the lights and noticed an electric light parade marching across my intake manifold and jumping from all the spark plug wires to the exhaust manifold. I knew the distributor had a lot of play in the shaft and the coil was testing marginal, so I decided to just get a new (rebuilt) distributor and put in the MSD coil and brand new wires that had been sitting in the garage for the past 6 months, waiting to be installed. Anyway, I replaced the distributor with new pickup and module, cap and rotor (Accel), AC Delco plugs gapped at .40, MSD wires and Blaster coil. I used a MSD wiring harness for the GM dual connector coil with good crimp connectors and wrapped all the connections with self-vulcanizing electrical tape. Long story short, the light show is EXACTLY the same, only it is much brighter now because of the MSD. The strange thing is that I replaced EVERTHING except the original GM harness connections. The one from the coil to the distributor module ohmed at 0, but I don't know how to test the power lead going to the coil from the factory harness. Obviously, I have a bad ground or short somewhere, but how do I go about the diagnostic on this? I know the juice will follow the path of least resistance, but I have never seen so many different spark "leaks" at different places at once. UPDATE: I decided to isolate the coil to see if the arcing would stop. So, I attached the coil with some nylon spacers and wood screws to a small piece of 1/2" plywood and attached that to the firewall above the distributor, effectively insulating the coil from any metal contact. No more arcing on the intake manifold, but ALL the plug wires were still arcing like crazy. So, I ohmed one of the brand new MSD wires (#8) and it was bad. (It showed infinate resistance). So, I replaced that wire with a Taylor Spiro-Pro that I had as a spare. It is about 2.5 feet long and ohmed at 643. Good wire. Just for good measure, I replaced the spark plug with a brand new AC Delco gapped at .37 (even though I just replaced that plug 1 week ago.) I fired it up and, of course, it was arcing like crazy on the #8 wire. I pulled the #4 wire and did the same proceedure with a good wire and a new plug and the same thing. Arcing like crazy. So, I did #6 and #2 with known good wires (674 and 642 ohms) and brand new AC Delco's gapped at .37. Still the light show.I replaced all the brand new stuff I put on one week ago with NEW brand new stuff that tested good and it still arced like crazy. In one week, my brand new MSD wires were all fried. The idle is hunting and surging, but the truck runs pretty good. Power is fine and mostly smooth. WTF? /forums/images/graemlins/angryfire.gif It seems that the secondary ignition is firing a little hot and if frying everything in a hurry. What would cause this? I can effectively rule out the cap/rotor/module/pickup/wires and plugs. What else? Would the ESC cause this type of problem? A bad ECM ground? I am at a loss. ANY help or suggestions would be apprreciated.