Hello, I have limited mechanical knowledge, but my Z will cut out while moving (usually between 30-55 mph). It happens very randomly, no pattern that I can discern. It will cut off, and will sometimes restart by itself, other times not. I took it to a mechanic, and they replaced the ignition module, no luck. Then they said it was the computer. Being the computer is very expensive, anyone have any other idea what it might be? Thanks.