Alright, here's my story:
I got a 75 k10 from a local widow. Said it was her husbands old truck way back when.
Motor was garbage, so i yanked it, bought a 76 k10 with a goodwrench motor with low miles that pretty much just sat for the last few years. Pulled that motor out, dropped an aluminum intake and a edelbrock 1406 on it and then dropped it in my 75. I put headers on it, then had it welded to fit the existing exhaust. It ran decent, but smoked a bit. LEft out of town for like a month, came back to a truck that wont run. I was mind boggled. Pulled and swapped distributors out, but still wont run.
Curiously unbolted my exhaust, and then it started to run kind of
Ends up theres nesting from rodents and such all in the mufflers, jamming it up. (also causing some smoke.
Now i'm here. Only a few cylinders are firing. then when you push the throttle a little bit in, it starts to fire a few more, but still not all. I'm sure i have tdc, and i have good gas. Wires are in the right firing order, and when i put my timing light on each wire they all light up, so theyre getting spark. I also have a wire with a switch going from the battery straight to the dist., as others have suggested to get that out of the picture. I JUST pulled the plugs out, (they were brand new from autozone when i dropped the motor in a few months ago) gaps look good, they're all black but should give spark. Next i'l put them in the wires to make sure i'm seeing a spark.



ANYONE have ANY idea what else could cause only a few cylinders to fire?
Thanks in advanced.