IH 184 develops a skip

My 184 starts good and runs good for about 45 minutes then starts to develop a skip. The longer I run it the worst the skip gets. Its a 12 volt system. When the tractor sits overnight it runs OK again. Today it was skipping a little and I let the tractor sit idling while I moved another tractor and it stalled and wouldn't start back up. I put my hand on the coil and it was too hot to touch. After lunch the coil had cooled down and the tractor started and ran OK again. I had the coil go bad last year and replaced it with the current one which says 12V, no external resistor needed. It does have 12 volts to the coil. I happened to have it when I was trouble shooting the last one last year and at that time it fixed the problem. The coil doesn't have many hours on it. Does this sound like a coil problem and if so what makes it heat up and begin to fail and then work OK when cooled down. I would have thought when a coil started to heat up and not work right it would just keep on going until it wouldn't work at all - that's what happened to the old one. I don't recall why I have this coil to start with - could I have damaged it doing something with it for the original reason I bought it which I can't remember.

It is likely just the bad luck of a bad coil again. If the charging voltage of the tractor @ 2/3 throttle, is 14.2 to 14.6 that coil should have been OK. Leaving the ignition on for 1/2 hour can also kill a coil and points. Put on a new one. Jim

Jim - thanks for the reply. I'll check the voltage going to it before putting on the new coil.