Hello everyone, I'm new at this so please forgive if not doing something right. I have a 1992 STS with only 60K miles, love the car but something strange happened today. The speedometer dropped to 0, everything electronic flatlined, and the transmission dropped out of overdrive. From a dead stop you have to manually shift the car otherwise it tries to starts in 3rd gear.

The following codes show all history, E052-I034-A050-I052 (for some reason nothing current, even though the check engine light was on during the time)

I made it home, and now it's fine.

Any thoughts?

Check all cable connections, the cables themselves, and the battery. Wiggle all the connectors on the ECM. Low voltage seems to make these cars "psychotic", for lack of a better term.