I had a 94 that had the same problem...it was the ignition coils

Jinx had that very same problem when I took delivery of her. Turns out the kid that owned her before me drove around town for quite some time on 2 out of 3 coil packs, which dumped fuel into the chambers, leaked down and thinned the oil. This in turn caused several rod bearings to spin.

Did you happen to check out techinfo on how to check the coil packs? And did you check the ICM plate for coil terminal corrosion? Even if it were the coil packs, it may be a moot point now as the damage may already have been done.