[S ECU Repair]

"Gremlins"? Jejeje...love it!

Couple of things to think about:

The only thing t"electronically" hat I can think that can shut down your car while you are driving might be a bad Reference Sensor, DME Relay, or ECU.

I highly doubt that a bad Immo can shut your car off while driving, there is a chance that a bad Alarm could kill the car.

(BTW the Immo and the Alarm are 2 different Control Units in your 993 in case that you didn't know.)

Now, you say that you can disable the Immo by pressing the Remote. This means that at least some of the fuctions of the Immo module are working.

However, the Immo also tells the Alarm unit when to open/close the door locks. This 2nd instruction may not be passing over to the Alarm unit, or the Alarm unit is receiving it, but it has a problem of its own that cannot carry out that instruction.

Have you connected the PST2 yet? Any fault codes that you got that may give us more clues?

Let me know