So I changed the plug in #1 and that cured the timing light not firing. I put in new plugs, rotor and dizzy cap, and reset the timing. It started more easily and idled well, but it still stumbles on acceleration and I am hearing what sounds like a rod bearing knock under load. I swapped out the pertronix with points and reset the dwell, The engine ran the same, still stumbles and knocks under a load. I cannot hear the knock at idle anywhere using a stethoscope. I would have thought that I'd hear a bad rod bearing even if it wasn't under load. Could a bearing going bad explain the stumble on acceleration? Maybe I need to move this question to the engine forum.
