Returning from an hour long highway drive, my 740 began act up: First, the tach jumped around, around 2500 RPMs, but the engine didn't stumble, then the engine began to stumble on acceleration- just at the point where the boost comes on, according to the guage. Ran fine as long as I was easy on the pedal, but I began to smell something like overheated electronics. When I got off the thru way and took my foot off the gas, the car died and would not start. After it sat for maybe 20 minutes, it restarted, and I was able to drive the car about two miles, before the entire car died- no gauges, lights, etc. I pulled off the road, and tried to restart it. the engine lights came back, but the car would not start.

I am guessing that the ECU failed, but does anyone know better than I about this problem?

If the ECU is the problem, what units will interchange?

thanks

Rick