I have been looking thru recent threads and cannot find one that really matches my problem... On a 2002 ultra, vh slip ons, s/e 203 cams and p/commander after a slow ride that really built up some engine heat I noticed the engine missing and popping. After a cool down and richen up the p/c low button, same problem. It seemed like it was dropping a cylinder at times but if I got the rpm up to 3000 or better it would pull hard but once slowing down it would start bucking and spitting again. Everyonce in a while it would run pretty good. We changed the gas and added some additive in case we picked up some water, no help. We disconnected the p/c and made no difference. Finally after about 50 miles we got back to camp. Pulled the plugs they both looked fine. Sprayed wd40 on the intake gaskets and did not really see any change. Changed plugs and it ran great for 5 miles, same problem. It is not setting any codes. Is it possible the wd swelled the intake gasket enough to make it run fine for 5 miles then start missing and bucking again. Would the cam sensor set the check eng light if it was faulty? What kind of problems will the cam sensor cause. I am still leaning toward intake gaskets but just wondering if anyone else had any other idea. Since it pulls hard above 3500 does this rule out fuel filters and pump?