we could be "more sure" if you gave us a serial number, but my bet is your machine is a af82E series truck, and where your problem is, is related to the crankshaft sensor, and the wheel that is read by the sensor. check for anything caught in the wheel, and then use a non-magnetic (brass) feeler gauge to insure the gap (in 4 spots, mark the wheel for 3,6,9,12 o'clock positions and then check all 4 spots for the same gap. The pickup is a magnet and if you try a regular feeler gauge you won't be able to tell when it is too loose.