The scenerio is that my engine was running perfect; smooth, power, everything. Then I lost spark in my engine. I ended up taking it to a shop and they changed out the stator, trigger, checked the cdm's and gave it back saying they couldn't figure it out. I changed the flywheel and got spark back. Now the engine will not run unless I start it and keep the idle arond 1500 rpm. If I run it lower than that; it will backfire and stop the engine instantly. When I run it at 1500; it is still rough. Maybe a wire is loose or something is not set correctly now? Any advice?