did you find a solution in the end? Just took mine out for a drive and it backfired and now idles rough as hell and when i was trying to drive it home it was dropping in revs and had to over rev it to get it not to stall. Any ideas? ive checked plugs etc and doesn't look like any water got in there, tested it and seems to be misfiring in cylinder 1 and 2 as when the 1 and 2 leads are removed there is no change to the idle and doesnt stall. Checked the dizzy and slight corrosion but nothing major so its not the dizzy, spark plugs were changed about a month ago so that are new so wont be the issue. PLEASE HELP!