I have a 1991 Mazda B2200 Pickup. Riding down the road, the motor just stops. Checking for the problem, I used my timing light. Found out no spark to any of the plugs. I tried again to start it up, to my surprise, it started right up. Ran down the road about 2 miles, stoped at a stop light, it just shut off again. Same thing, no spark to any of the plugs. Could not get it started, had to have it towed in. The only thing I've done to it is chang the distributor cap. Did no good. Do you think it could be the ignition coil or the moduel? Thanks Jonnielazy