i posted this in the 73-91 specific forum, i'm hoping i get more views here, sorry if this frowned upon.... pasted from old post: ------------------------ I acquired an 86 k5 blazer about a month ago and it ran, though i only got to drive it about 15 miles before parking it for a month. It has been thoroughly desmogged and kluged in innumerable ways. I tried at least starting it a few times in the mean time, though only managed to find time to drive around the block. No problems, i think. Yesterday i decided it was about time to bring it the rest of the way home, a whopping 6 miles. It made it about 3 blocks before refusing to start. During the three blocks it would run ok till i had to stop, then cut out and immediately restart. this trick it did twice. It was at one of these stops that it didn’t come back. i replaced the distributor cap, rotor, coil, plugs and wires. I presume the timing is good enough as it did run not too long ago. I forgot to reconnect the plugs in the dizzy for a minute or two of cranking, and it almost caught when i did reconnect them. It didn’t stay running so i tried grounding a spare plug attached to a wire to the intake manifold and it didn’t spark at all. The carb is a holley 650 double pumper that is probably doing too much pumping. When i removed the old spark plugs they were dark sooty black. another oddity: if i get it to start and run, removing the negative lead from the battery smooths out the idle and the revs seem to pick up a little (no tach, so not sure) So, my theory is that for whatever reason i wasn't getting consistent spark and now somethign has completely failed. I’m not sure where to start, i’m not a good electrical person, and any help is much appreciated. thanks ----------------------------- yesterday, 7/10, the ignition module was replaced and still no luck. any help is appreciated. i have a carb rebuild kit on the way, as well as some smaller main jets. i don't think it's the main problem though.