After 65000 trouble free ks my 06 street bob began missing and cutting out . I could not find out why . I changed the plugs , the leads , the fuel filter , the crankshaft position sensor . I bought a new engine management computer but still the problem persisted . The dealerships diagnostic computer showed no faults . Finally after spending $550 in guess work I bought a $9.00 fuel relay and the problem was fixed . Wes Martin