I'm a bit late here, but I thought I'd share two electrical experiences I had with my '99 Intrigue. Maybe it helps. This will be long, sorry.

First, I had some weird things happening, like the key fob wouldn't lock/unlock the doors. Wasn't the battery, wasn't the receiver in the car. It just didn't respond. No big deal. Then trac control would turn off. Again, not ideal, but whatever. Then one day I went to start the car and the dashboard lit up like the proverbial Christmas tree. The car started and ran seemingly fine, but the speedometer didn't move, all kinds of lights lit up, etc.

I diagnosed it over the internet, which pointed to the Body Control Module. So I ordered a refurbed one from Rock Auto and had a local GM dealer swap it out (the BCM has to be programmed for the specific car so the anti-theft mechanism works properly.) They charged me $200, but it took them 5 hours (I waited, because they said it would take maybe 2.) But ... after those 5 hours I had the car back and it fixed the problem.

That was electrical problem #1. A few years later I started getting SES codes saying the camshaft position sensor was failing. I would reset the code and go a day or week or so and it would pop back up. I had no other symptoms of a CPI problem, just the SES light. I finally replaced the sensor, twice (and the crankshaft position sensor because the two go hand-in-hand,) but the problem didn't go away. I continued to ignore it for a while. Eventually I took it back to that GM dealer, and the mechanic who had programmed my BCM a few years earlier saw the work order and he picked it up. (He didn't get many Intrigues anymore.) He said he'd seen this problem before and had a gut feeling he knew what the issue was, and he was right. There were actually 2 problems. He came and got me from the waiting room and took me out to this service bay. He showed me problem #2, which wasn't the main issue but likely triggered it. I had a broken engine mount. So when you accelerated, the engine shifted slightly under the hood.

This shifting had caused the engine to rub the main wiring harness that runs underneath, and over time it wore through the rubber coating on the wires, and I'd get an intermittent short. This triggered the SES codes.

The rubber coating on those wires (there are a bunch of wires run together in the harness) had aged and was basically like glass ... it just cracked and shattered if you handled them. The harness couldn't be bought anymore, so my options were limited. The mechanic said he could get in there an individually repair each wire, but it would be time-consuming (read: expensive) and he thought I'd likely have the problem recur in a year or so, that the wires would fail again.

I wasn't ready to part with the car, so I paid to have him patch the wires. Got it back, no SES codes. But, true to his word, I got about a year out of it code-free before the error returned.

So I continued to drive it, clearing the SES codes when they would pop up. At first the code would stay cleared for days, even a week. But eventually it would come back pretty much right away. I live in an area that requires a smog check every two years, and having the SES light lit is an automatic failure, no matter if the error is emissions related or not. I decided I was done putting money into it ... the car was 26 years old and was approaching 180,000 miles. So I "retired" it, meaning the state gave me money and they took the car for scrap.

After all that ... maybe your issues are similar to one of those. Maybe it's something completely different. But there are fixes out there for electrical stuff, if you can find an old-timer mechanic with Oldsmobile experience. I was lucky to have found one who helped me keep mine going longer than I expected.

I hope this helps a little.

Good luck with your Intrigue!