PJ wrote
"I'd tend to think that at this struggling stage of operation, the ECM
hasn't brought the O2 sensor into the loop yet. (IIRC, that's about
104
deg on the '89)"

Thanks for the ideas, I like the injector harness idea, I will
investigate, and the TPS - I think I should be able to trouble shoot
that with a multi meter. That could expalin a lot of what is
happening. I did manage to bring the coolant temp up to about 160 so
it should have been in to the 'loop' by then.
Thanks also to 'Dad' for the codes. I think this car has only OBD 1 so
I am not sure how much crossover there is.
I am trying to get a crash course in C4 maintainence here, I have owned
this car for 10 yrs. and besides a bad IAC and one relay (burnoff for
O2 sensor) it has run like a watch the whole time (total 56K miles).
Not much incentive to delve into tuning issues on it.
This malady was very sudden onset, brought on by a bad battery, which I
should have mentioned earlier.
When the battery was replaced the car "woke up" doing this.

Again, thanks all for the tips and hints
Dave G.