As of last week the Mac Super Pro 80 was back up and running.....until today. It was a spark issue that I thought I had cured. This saw had no spark when I got it but it was caused by the woodruff key being sheared off and the plug wire was pinched and cut through the side cover. Once I put a new key in it an replaced the plug wire it fired right up and ran. I finally got a bar and chain for it and it still ran. A couple of days later it would just "pop" whe you pulled it over. Pull the plug and it has very little spark. Couple days later it fires up on the second pull and I hadn't done anything to it. It does this starting and not starting thing several times. I replaced the condenser last week due to no spark, as the coil tested good, and it had bright blue/white spark once again. Runs and cuts great.....Today it has no spark again. Points are new and gapped to .018", plug is new, plug wire is new, condenser is one I took from another saw and obviously worked, condenser is properly held down and grounded to the case. I can disconnect the kill switch from the coil when it has no spark and still nothing. Coil is gapped .010" from the magnets on the flywheel. Magnets are strong. Can a coil work and then not work and then work again? I have had them weak or bad but never not work and then work again. The coil is my last thing to replace.