This was exactly what was causing the drama. Pulled the over off and there was water that had pooled around the coils. Blew most of the water out with a blower and reassembled everything. Hooked up the oil pressure gauge to the side of the block just to eliminate any doubts I had. Car was missing again briefly but returned to normal fairly quickly with oil pressure reading fine on the gauge. Thanks for the advice mate, I was assuming worst case scenario as I was mucking around with the oil but ended up being a happy enough ending.