Ok I started a thread a couple of years ago about my 390 in my bronco missing and cutting out. I am still having trouble. When the engine is cold and it pulls hard with the rpms low it sounds like it it hitting on about 5 or 6 cylinders. If you go to a lower gear and raise the rpms it goes away. Once warm it cuts out very slightly on a long hill with low rpms. Once the rpms go up it runs like it should. Here is what I have replaced, plug wires, plugs, control modular, coil, pick up coil, wiring harness from dist to the modular, switch, I have also made the carb a lot richer and replaced the gaskets under the carb. I have done a compression test with engine cold, it ranged from 135-150. The vacuum is 16 at an idle. I dont know what else to chance or check. Could it be the intake leaking? What ever it is gets better once the engine is warm. I have sprayed stating fluid ever where and found a small leak under the carb but replaced the gaskets and now the leak is gone there. I dont know how to check the intake because most of it is under my valve covers. Any ideas would be great. I need it fixed this is my daily driver and camper puller.