Oldsmobile 98 Error Code 63 & 64

Hello, I have a Error Code 63 & 64 in my 1988 Oldsmobile 98. From looking it up the information I got was:

PCM Computer Circuit Problem - Random Access Memory Failure

and

PCM Computer Circuit Problem - Electrically Erasable Programmable Read-Only Memory Failure.

The EGR Valve is new.

Car is losing volts when getting up to speed and try's to turn off.

If no one has recently replaced the prom or removed/installed it, sounds like an ECM problem.....

Late 80's, early 90's were not good years for computers....