Well, I replaced the fuel filter, turned the idle screws all the way in and back out (it was just over a turn and a half each) and gave the carb a shot of carb and choke cleaner. I was able to get it to idle for a little, but just getting the thing into the garage was a battle. It dies as soon as you put any load on it, so I checked the timing, but it was right at 8 degrees BTDC. Any other ideas?