Merc

I was preparing my 94' for a day at the track this weekend and the car started to randomly stall as if all power had been cut to the ignition. It seemed to be independent of whether I was running the car hard or simply cruising. While running however (specifically under full throttle passes), it runs great and will idle all day log.

The problem is completely unpredictable - one moment I am cruising along and the next the engine is dead (although it did seem to happen more when I was not under boost). I can restart the car with no problem immediately after it dies.

I am running a recently updated (less than a year ago) PFS purple box, and a Jocobs ignition pack (among other things). It seems to be electrical in nature, but the connections on the Jacobs appear to be fine. I tried to disconnect the battery but that did not help. The next step is to remove the PFS unit and try to run on the stock ECU. Thoughts? Thanks in advance.....