I have a 1986 Evinrude 30hp. It is getting an ittermitent spark. Yesterday I went out and tried to start it and nothing happened. I pulled the plugs out and did a spark test and there was nothing. Then I tinkering around with the engine and tried a spark test again and I got a nice spark. Put tthe plugs in and fired right up. Ran for about 3 mins. and cut out. Tried a spark test again, no spark. Went in for diiner and came back out and fired right up. What could possible be the problem, all wires look good and tight. Dont know what to do next. Thanks
