I had similar problem on my cj with a 6CYL.The float was way off and it was flooding the carb.Gas out top,middle and bottom.I rebuilt the carb for 20$ and it still would'nt crank till timing was near exact and I changed out the fouled set of plugs.123&4 plug were just black and 5,6 were wet.After new plugs fired right up.Good luck.