my 51 3100 has a rebuilt '56 235, with about 11k miles on a pro rebuild, and yesterday it backfired once, and then started cutting out intermittently. It's still running and just cuts out every few seconds or more. I checked the plugs last night, and they all look good. I recently filled up the tank with good gas, even though it's almost like it has water in the gas. When checking the plugs last night, the back plug wire 'came apart', though I don't know if it was just the vacuum on the boot that pulled the end connector off, or if it was loose before that. I'm going to try to fix that cable today before buying a new set at the first of the month. (This set looks nearly new, though). I also noticed the wire from the resistor block to the coil was off after I pulled the back (bad) wire, so that may be another possibility. I just passed 3,000 miles, so I'll be changing the oil at the 1st of the month (pensioner- check comes the 1st!!), along with the air filter, plugs, etc. Also, it has a small metal filter at the carb, which, after the last time I checked it, doesn't look like much of a filter. I'm installing a clear paper filter in-line down by the frame when I do the oil change. If anybody has any other suggestions as to something I may be missing here, I'm all ears! Thanks in advance for any suggestions or opinions. Lee
