I have a 98 softail custom evo motor with mikuni carb. Yesterday on my way home from i almost made it back it started miss firing and popping like crazy. Pulled over checked the plugs they were fine threw a new set in anyway. Started it back up and same thing. Would idle fine but as soon as you hit the gas it pop like crazy walked the bike home started it up and it ran fine. Possible vapor lock? i was sitting in some heavy traffic for quite some time.