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Those symptoms are almost identical to what I experienced with a bad PROM in the ECM. I am not certain what the 91 uses since the transaxle is electronic and I believe it is an integrated unit, a PCM. The lack of a couple dash displays, rough running, cooling fans turned on are identical to what I experienced. When I tried onboard diagnostics, I received an engine data or communication error.

Sounds like a failing Ignition Module/coil pack. Try your previously tested spare and see what happens...

The outlet nipple on the original windshield pump in my 1990 Reatta broke, dumping the fluid out. There are several choices for new pumps on Amazon ranging from $8.59 for an unknown brand to $28.05 for AC Delco. Regardless of brand, they are all made in China. I bought the cheap one, which leaked within minutes after installation. Thanks to Amazon's return policy, I sent it back for a refund and bought the more expensive AC Delco which also leaks. There are "weep holes" around the circumference of the pumps which are apparently intended to keep the electric motor from being flooded if an internal seal in the pump fails. The AC Delco pump leaks at weep holes on both sides of the pump. I thought maybe the pump needed to be run to prime it and lube the seals, then maybe the leaks would stop. So I connected 12v to the Delco pump on the bench and it pumps strong but still leaks at the weep holes. The leaking Delco pump will be returned and I will try yet another pump brand on Amazon. It's quite possible every pump regardless of brand comes from the same factory in China. Any thoughts about what's causing the weep hole leaks? I am using Rain-X windshield washer solvent. Maybe I should try a different brand in case the Rain-X stuff isn't compatible with the seals in the pumps. See the photos.There are several weep holes on the circumference of the pump. Circled in red.