Well it is not the coil, I replaced it with a known good one and I still have the problem.

I still don't know why when I close the choke the truck runs better. I always thought that meant a vacume leak.

I will check the tank and hoses next. I bet the tank is full of rust and dirt etc. etc.

52 Chevy 3100 5 Window, LS Swap, 4spd Auto, Vintage Air AC / Heat, CPP Power Front Disc Brake Conversion with bearing upgrade, Power Steering Conversion, LED Tail Lights