Jim, thanks for the great info. My 1993 3.2 has a similar problem but no dash warning lights come on. I repalced the OVP a month ago, now it Starts up great and runs fine for a little bit, 1/4 mile, 1 mile sometimes, then it goes into limp mode and it appears to run on less than 6 cylinders.
The engine wiring harness looks OK, pliable wires.
I removed the ETA today, just wondering how can I assure myself that in fact is the ETA causing the problem before I go to the dealer and get in debt. Have you found any repaired units?
Thanks.

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Thanks, Juan