sure sounds like classic ECU or coil acting up. do a quick visual on the pickup/reluctor (anything loose). next time it does it (1) pull coil wire (dist end) & hold it 1/4" from intake (ground) (2) pull yellow wire with tracer off of starter relay to disable the starter (3) turn the ign key to "on" (4) you seperate the dist pickup zigzag connector and drag the male terminal on the body half of the connector with your right hand along the intake surface which will make/break contact just from the dragging due to the surface irregularities in the intake metal surface (5) at the same time with the coil wire in your left hand see if it makes sparks to the intake surface. Work FAST as you need to do all of this while the pickup is still hot. holler back EDIT No need to pull yellow wire off of SR (was thinking of a (similar) issue)