I have a 2006 Deluxe with stage one and 2000 miles since I replaced the stock HD plugs with autolite plugs, I've always had a small amount of dcell but now I have more hesitation when it is cold and some popping under low acceleration and when I'm cruising at 30-40 miles per hour a intermintant popping. After I get on the highway and it warms up real good it does clear up, but if I park it for 45 minutes or so and get back on it's the same routine, I have never used fuel injector cleaner because I haven't figured out the ratio of cleaner to gas. I have been going through alot of the threads and there is alot of possibilities, where to start??? Spark plugs, intake leak, injectors, I need input where do I start first? Almost forgot, the bike has 18,000 miles on it.