Been working on this problem for several months. My motor (1115422AY) seems to have an intermittent miss from idle up to around 2000 rpms. Even had it miss at 5000 rpms occasionally. Seems worse in the mornings when it is cold. Once warmed up it seems better. Pulled the plugs to see which cylinder is missing and no obvious clue Took the advice of the helpful folks on this site and cleaned the carbs, fuel filter, hoses etc with no solution. Read the CDI trouble shooting guide page 118 (http://www.cdielectronics.com/troubleshootingguide/) and want to check the ignition system with a DVA. Is this just with the key on, cranking or what process? Is this checking the peak output voltage? I have a Fluke 87 with the "peak" function. Would a faulty voltage regulator cause low voltage to the ignition system? I also read somewhere to do High Speed shutdown and inspect the plugs. Would it be helpful to run the motor say below 2000 rpms while misfiring for a short time and then do a shutdown and inspect the plugs to see which cylinder or cylinders and misfiring?
