First, use the black pepper to season the pork chops on both sides.
Put the oil in the Instant Pot, press "Saute" and add in the pork chops once the oil is hot. You might have to do a few batches. Brown on both sides.
Once that is done, add in the chicken bouillon and the water.
Put the lid on the Instant Pot and seal the valve, and set to "Manual" high pressure for 8 minutes.
Once that is done, allow for the pressure to naturally release. This should take 10 to 15 minutes.
Put the pork chops in a plate, and then remove all up about 1 cup of the juices.
Put the Instant Pot back on "Saute" mode and then add in the cream of mushroom soup.
Stir in the sour cream and then cook until it has become heated up, but do not boil it.
Now, you can add the cream of mushroom sauce on top of the pork chops and serve.