89 b2200 runs 20min+/- shuts down.

89 b2200 runs 20 min+/- shuts down. will restart when cool. temp. reads average. new fuel pump/filter. cap/rotor/ignition pick-up/wires/plugs. have a new weber, not yet installed (looking for advice/diagrams). suspicious of the cat/muffler. smokes like a beeatch upon cold start (valve seals most likely). first mazda, usually run diesels, could use some direction.

I just got into mazdas and not sure if this truck even has sensors but I have had the same problem with a Chevy tracker I had and it was the crank shaft sensor