I'm getting some really poor acceleration out of my bike. when it runs, it backfires when i quickly let of the throttle, if i pull the clutch in and let the rpm's drop without revving, the engine will die. when i get on the throttle, it stutters for a little while and then gets going with less than desirable results. here's what i tried: first i thought it just wasnt getting any fuel, but no, fuel is flowing just fine out of the petcock and the fuel pump. then i thought it could be a clogged pilot jet, nope, cleaned them all out and nothing, checked the pilot air jets too, and all clean, i cleaned the spark plugs too just for the hell of it. after that i went to the airbox, i cleaned the filter and cleaned out the airbox...again, no improvement. after that, i started wondering if the air/fuel screw somehow got readjusted, so i readjusted them all to 2.5 turns out, nothing again. now i started wondering about the ignition coils. i tested both primary coils, they were within the tolerable resistance as stated by the clymer manual. after which i test the seconday coils, both come back with a reading of double the resistance of the max allowable. my question is do coils go bad in pairs like this, and when they do, will they both give an almost identical resistance reading? and if its not the coils, does anyone have any other suggestions. sorry for so much reading.