I had the same problem with my '87 Syncro. It started with momentary cut outs
and then progressed to complete cut outs or loss of power. The engine would
just shut off like someone pulled the plug. It would then start right up
again.After many frustrating hours of trouble shooting and the local dealer failing
to Diagnose the problem, I found out it was the ECU. I tried another ECU out
of a friends Syncro and the problem went away. Yes, I gave it back,
reluctantly. Joe in NH, still looking for a Syncro GL