GTV6 Problem

[DaveM <doc1590@domain.elided>]

I've tried to help lots of people on the Digest with
their problems and now I have one that has me baffled.
 1984 GTV6.  Runs great, starts fine!  BUT! When it
idles for any length of time it starts popping,
running rough and quits. It seems to run if I rev it
over 3000 or so, but as soon as you try to drive it,
and it falls below that, it loses power, runs very
rough and sputters to a stop.  It will restart and run
fine after sitting for a half hour or so. Drive in
lines at banks/fast food... traffic jams...  are
deadly!!!  No matter what the weather.  
It seems to be more related to either underhood
temperature or some other static situation than it
does engine temperature.  Although, it's never done it
unless the cooling fans were running.  They never come
on in normal driving, only when sitting.
I have spare everything and have changed:

Coil
Ign. Module
ECU
Hall Sensor, then whole distributor

I've removed all connectors and cleaned them including
all ground connections.  It does it with O2 sensor
connected or disconnected.
I connected a Bosch Autoforce tester (the expensive
one in the briefcase thing) and pretty much eliminated
any of the sensors or fuel system components except
pressure regulator and AFM (the Autoforce tester
checks the temp sensor in the AFM but not resistance
of the flapper).  I have not checked fuel pressure as
yet nor have I changed spark plugs or wires.

The problem is thermal and I believe underhood.  I get
no black smoke indication of overly rich, but I
haven't actually checked Stoich.

Any ideas would be appreciated.

Dave Miller
Deltona, Florida

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