Okay, when the car shut down, I ran a scan test on the OBD1 and got these codes.
31, 41, 43 & 58
I thought they were erroneous because I had just had the cam sensor changed. And when I disconnected the battery, the codes obviously disappeared. On a second check of the OBD, the only code to reappear was 58.
So, it quite possibly could be the cam sensor. But the ECU did not pick up those error codes the second time. This lead me to believe that they were misquotes.
Thank you for all your help. I look forward to your suggestions. And will try to find in the manual as to checking the cam sensor for a failure.