My Like had been running perfect when I parked it. Next day I went to start it and the motor turned over fine but all I could get out of it was an occasional fire and mis-fire... Gas is full. I can hear the fuel pump running. No trouble code showing. I pulled the spark plug and grounded it out and turned it over and I get occasional spark. Very erratic, sometimes strong sometimes weak and most of the time no spark at all. I tried the visual spark test with another spark plug and had the same results. I started looking for bad connections and couldn't find any. I guess I will have to check these components one at a time. Ignition coil. Pulse coil, stop switch, key switch, ground wires for coils, tilt switch and ...I don't know how to check the ECU. This Like has about 1700 miles and has run perfect. Any thoughts or fixes would be appreciated.