Good chance the rough idle cam related considering your year Vince. Lot of premature cam wear in those years. That and common issues with the CPS.
It's just an annoying vibe at idle.
I had the pan off to do the rear main and visually, the cam and gear showed no abnomal wear.
I also replaced the OPDA which came with a new cam sensor.
The vibe at idle goes away the second the throttle is pressed, as soon as it comes off idle.
I also have your old 33 Engineering skid that may be contributing to the vibes at idle.