I got a Ford 4000 3 cyl that runs very rough. I had New Holland rebuild thr carb, but still have the same problem. When I installed the rebuilt carb, I couldn'get it to start. In doing some testing, I found I have no spark. Put on a new coil, but the same and rechecked the points. What I did discouver was jumping the + side of the coil to the + of the batt it started, but runs really rough and at time backfires. Took the jumper off and It started to settle down and ran pretty good for a while then back to the rough running thing. For sure, I have to do the same jumper to the coil to get it started. I pulled the three plugs and they were fairly black which tells me it's running rich. It runs better at low rpm's, but as I advance the throttle, it starts running really rough and backfires occasionally. Is there a possibility the vacuum advance is not working and why do I need to jumper the coil?
HELP!
HELP!
