96 Johnson 105 hp jet drive. Engine runs fine for about 1/2 hour then its like someone shuts key off. No spark from power pak. Had it to 2 shops, replaced power pack and flywheel sensor. Runs fine for same 1/2 hour to 45 min, done no spark. Some times spark returns after setting and then again maybe not. Left stranded on the river twice, not allot of fun.....

