Any help is appreciated. Background: Bought this in running condition last August. Ran, but not great. 2150 Motorcraft carb with venturi meant for a 350/360, worn points, and spark wires out of order. Repairs last fall: Ignition (+) wire to a 42a relay on the firewall, that pulls a 10ga wire from the battery to feed three fused circuits. Fuses to coil and choke, to fuel pump, to radio. Pertronix Ignition (pointless replacement), with slightly hotter coil (30k instead of OEM 20k) Electric fuel pump and regulator. Cheap Mr. Gasket red pump and reg. (bites me later). Rebuilt Carb with a kit New cap, rotor, plugs(NGK XR5 3332) , wires. (other stuff, but does not pertain to the issue). The truck ran fine all 500+miles in the fall and winter, and early spring. In April, it started “surging”. This happened right at start up after sitting in my work lot 4hrs. It is enough of a surge, that you cannot drive it. It shakes the drivetrane going down the road. It does it from idle all through the revs. Then suddenly stopped after 10mins. And ran fine for two more days. I chased this random issue for a couple weeks until it became more permanent. Repairs last 6 weeks: - (and issue randomness comes back) Fuel Filters before pump and carb replaced. Fuel Regulator – found as the truck hit bumps, the pressure would go up and down from 2 to 7psi. Replaced it with a Mallory unit with wet gage. Carburetor – replaced the Motorcraft 2150 with a rebuilt 2100 with correct venturi and jets. Seemed to run fine for a few days, then issue started coming back While it was running without surge, I sprayed all around the intake manifold with carb cleaner looking for a leak, but could not find one. Compression check – 120-130 on all cylinders. Pulled the valve covers to check for a cracked/broken valve spring, none. Started to measure rocker throw. Most in Odd bank were the same before I lost oil in the lifters and had to stop. Distributor – found it full of crud, small amount of bushing slop, with incorrect centrifugal springs. – replaced with a rebuilt one. Seemed to run fine for a few days, then left me stranded when the cheap fuel pump died Fuel Pump – new Carter4070 with sintered filter in front of it. Ran fine for last two days and 25miles, now the issue is back when I went to start it this morning. Timing is set, and good. From what I read, Pertronix pointless systems either work or don’t, they are not intermittent?? Fuel system is totally replaced. It has new poly tanks (one has really old gas in it so I keep the vavle on the drivers tank only.) Has good spark If it was a bad lifter, I’d hear it. If it had a worn cam, it wouldn’t be intermittent, right?? Stuck valve?? But you would hear it too?? Debris in drivers tank being used – but fuel pressure is steady, and surging is every second. Carb bowl and system would have enough fuel to keep running many seconds. I'll try and post a decent video showing it, tonight. I am stuck and frustrated.