My 92 GMC Sonoma GT W Code 4.3L had the white cloud of death. Blown head gasket/cracked head. (Tore into it. Point to remember is I have the two piece intake manifold with the throttle body on the front and it looks like the intake off performance cars.) Took the top piece off and found a bolt riding next to the spider body of the fuel injector. (CPI) Also 4 of the twelve bolts where either only finger tight or finger tight/wrench loose. Pulled the bottem intake off because I knew I'd have to replace the gaskets after it getting that loose. Looked into the heads and found much oil sitting on top of sealed intake valves. Whew. No cracked heads or pushed gaskets. Just burning oil leaking up the bolt threads and hole. Got the new gaskets but now boycotting Fel-Pro, long story to be explained latter. Got her buttoned up. Now no spark to from the coil but power going in. Tested the ignition modual in the distributor and it's good. Brand new MSD coil (was cheaper than the Borg Warner I put in earlier this summer) did not fix it. I have a new mag coil pick up to put into it today to see if it'll work. I double checked everything as I was buttoning it up so I didn't miss any thing exept the A/C connector. It didn't work and I prefer windows down so no biggie. Won't reach now anyway because I rerouted some of the wires further from the header pipe. I'd rather take the whole A/C system out to save weight, space and engine drag. It may be the oil pressure switch beside the distributor. I spun it a bit and it tightened up and made some slack in the wiring so there's less pressure on the wiring connecting to it. But it's the power to and not out of the coil that confuses me the most.