No Body Knows?
 

I have a 1992 plymouth laser 2.0L, 4 cylinder, turbo (mitsubishi motor) that runs and then quits. It was suspected that the MPI control relay and the injector resistor module were at fault. These items were changed but there was no difference.

With these suspects does anyone have an idea what might be the problem?

check out the coil wier. I had one of these in a Lebaron, and it would do the same thing. after a $85 tow bill (the old days) and missng an appointment, I found this to be the issue.

Does it sputter before it dies, or does it just plain die, (like someone reaches over and turns of the key)?

If it just flat dies, then I also suspect something electrical. BUT, if it sputters before it dies, then it may be a fuel feed issue. Possibly a clogging fuel filter, pump going bad, or the in-tank filter getting plugged, or some other restriction.

To add something possibly related, I had owned a pristine 1984 Chrysler Laser (Dodge Daytona) with the 2.2. turbo and 5-speed. One day, it started randomly dying on me. Just plain dying, like I shut off the key while driving. If I let it sit for about 45 minutes or so (it seemed), it would restart, but not before. It would crank endlessly, but not try to fire at all.

The first thing I bought was a BRAND NEW dual pickup Hall Effect Sensor, as this was the most likely culprit. It didn't seem to help for long, as it kept doing the stalling act. After changing several other things and pulling out much of my hair, I finally gave in and took it elsewhere, to a trusted shop. They installed a(nother) BRAND NEW Hall Effect Sensor, and I never had the problem again.

Moral of the Story? You TOO may have gotten defective merchandise.;)