Problems seem to be cropping up as fast as I can solve them.  Latest
problem is engine shutting off on its own at idle with engine fully
warmed up.  This has happened even in my garage, but generally while
waiting for traffic lights.  Engine starts up immediately.  Problem does
not appear to occur while driving.  I have tried both my ECU's,
including one where I just resoldered all the connections from the
connector to the circuit board.  Fuel pump and ignition control module
date to September 2003.  O2-sensor, T-2 sensor, plugs, etc., recently
replaced

What should I try next?

John.