Yesterday, my truck died while in motion. Towed her in, went through a bunch of testing. Would run for a while and die again. Caught the fuel pressure at zero on one of the deaths. Switched out relays to f pump, still dying. Switched out ecu witha loaner, ran fine. Switched back, death. Somehow, yesterday morning, the replacement 95 disco ecu with the RPI chip i installed three months ago decided to start cutting power to the fuel pump at random moments.
Anyway, I still have the original ecu and running on that now. Moral: always good to have access to a back up ecu!