Here's the story:

1995 Montero LS 3.0L V6. Vehicle died in my garage. Cranked but wouldn't start. The coils were fried, as was the ignition module(?).

My independent mechanic replaced those and the vehicle ran for about 100 miles, then died on the road. Towed home. Checked the coils and the ignition module again. Fried. Replaced them and replaced the ECU with a used unit. Vehicle started. Ran for 30 minutes and died during my mechanic's test drive.

My mechanic has no way to test signals upstream of the dead ECU so I had the Montero towed to a Mitsubishi dealer shop. A WEEK later, they tell me the ECU is toast and that a new ECU would be over $700. I had told them we knew the ECU was dead when I brought it in. I needed them to find out WHY the ECUs are getting fried. They said they can't tell me any more until they put a new ECU into it.

Huh?

Can anyone give me and my independent mechanic any insight on how to find out what's killing the ECU? The Mitsu dealer isn't telling us anything we didn't already know and they have had the vehicle for a week.

I love my '95 Montero and need it back on the road!

HELP!