Hello All, I have been chasing a problem for the last week or so that my 2010 ultra classic will misfire under light load when I am on the highway. The bike has a 103", 255 cams, TFI, de-catted headpipe and SE Fatshotz mufflers. 23,375 miles on the odometer. I thought I could figure this out myself but I am coming the you guys for some possible insight to this. I have made no changes to this bike for the last 2 seasons. The problem began out of the blue, at first I thought I got a tank of bad gas but I have run that tank out, then I ran a tank with a stiff mix of seafoam though it plus 2 more tank fulls with no improvement. The bike idles great, pulls hard with no miss, in fact it won't miss at all if I ride into a headwind with some significant load on it. It seems to miss under light load like when I am riding with a tailwind, also when I am climbing a slight incline as I crest the top or just over the top (using cruise control) as it backs off throttle and just starts back applying throttle that's when it misfires. Some times it will just be one miss, sometimes it will miss several times in say a 3 second span. So far, I have taken apart battery connections at both ends, cleaned and reconnected using dielectric grease, checked all fuses for corrosion (which there was) cleaned and reinstalled all with dielectric grease, replaced spark plugs, inspected plug wires. Tested resistance on ignition coil, reading was 6.23K ohms. I am not sure what this reading should be, I know on older models it should be 10-12.5K ohms. Also checked to make sure gas tank vent is open. The problem to me almost seems throttle postion related. Sorry to be so long winded but just trying to give some detail. I am hoping someone can give me some ideas as I have a 10,000 mile adventure planned that is coming up on August 20 so I need to get this figured out. I should have added that I have not had a check engine light come on. I almost wish it would, maybe that would tell me what is happening here.