Hi, I know how frustrating it can be my moms Mazda has done the same thing 4 times. But back to the problem at hand. I would not fluff off the FAQ about the battery cable corosion, Check it out before you dissmiss it. Second I would check to make sure that the ground wires are in good shape. The 2 behind the cylinder head and the 2 more at the left front motor mount. I would then check your fuel filter for clogging, it could be that simple. The next thing is to do is a wiggle test on the engine wiring harness. If that does not turn up any gremlins check out the two ignition modules on the intake manifold. The connection can get water and grime in them and cause bad things to happen. Take conn. off and clean and fill with dielectric compound and reconnect. I would also check inside the cab where your ECM is and check the connector for corosion. It doesn't take much. Last but not least check the fuel pump pressure for low or high pressure while your out on a test drive. With a problem such as yours where there are no real clues it can be very labor intensive to find since the problem is so seldom. Good luck. I found the battery cable problem on my 92 because of the FAQ.