Been working on '70 Newport Custom 2bbl 383, new electronic ignition, for a while, and I'm stumped. Might be time to get to a pro, but I figured I'd ask the forums for help one more time. Car starts great, idles fine, feels really strong. I take it out on the road, and it runs great for about a mile, then loses power. It feels and sounds like it loses it in steps, I have to floor it to get enough power to get home and keep it from dying. I let off the gas and it dies. Try to start it, nothing. Everything looks fine under the hood. If I set the timing way off, like 30 degrees BTDC, I can get it to start, and then adjust it down to about 12 degrees, and it runs great and sounds fine. I take it out on the road and the whole thing happens again. I don't even know where to look anymore. Thanks in advance for any ideas.