1997 Cadillac Seville running on 4 cyl.?

In clearing the codes twice, what codes are they? If they keep resetting, it can be that a hard fault exists that is the root cause.

In my information, I do not find any info on limp home, and what it does. What is missing from the cylinders that are not firing, injector pulse or spark? There are two injector power fuses that serve four cylinders each. One fuse powers 1, 4, 6, and 7, the other 2, 3, 5, and 8. These are in the underhood fuse block. The PCM has individual drivers that control the ground of each individual injector. I think that in the event of an overheat, cylinders will drop off to try and bring the temp down. If you are just getting O2 codes, that should not cause cylinders to disable. Check that both these fuses have power to, and across them, and/or check that each injector has power to it on the pink wires.