It just doesn't run right-200 Merc

;DHappy day! I can't find the poster who suggested to get rid of the little black box (high speed advance) but that was the problem with the cutting out above 4600. Thank you for sharing your extreme knowledge! It ran great at high speed, at 5200 as long as i wanted (10-15 minutes). It would hit between 56 and 5800 and when I slammed it all the way down from 4000 or so, it jumped!
I still have a rough spot between 1-2000 which I suspect may be a coil. It's not real obvious which cyl is weak. I guess I'll have to run it for a while at 1500, then cut it off, pull the plugs and see which one looks like it's not firing, unless somebody has a better idea?? It'll be March before I see it again. ;D

Thanks, Trollercoaster