Checked the coil after driving for about 10 minutes and it was hot. What does this mean? Removed radiator cap after 5 min. sitting in the garage and not sure if I noticed water flowing. May re-check by holding a small piece of cloth in the top of the radiator to see if it moves.As I posted above, it could be that something (like a failing coil) is causing your engine to stumble and stall when hot, with the resulting low RPMs causing a lower oil pressure reading.
It could be that you have an additional overheating problem, but look into the coil first. A good coil will certainly be warm from use but should not be hot to the touch.