The stalling is not related to the oil pressure if the coolant is full, and at 150 as stated. The oil pump probably has a warped cover and can be fixed pretty easily by using a flat plate of glass to "flat sand" the cover to make it flat again. The end play should be between .0005 and .001". The pump does not need to be removed to do the repair, but the pan does need to be dropped. Be sure the long bolts in the end of the pan go back in the same holes, and are not over tightened. If this turns out to not be the problem, the engine bearings (cam, rod, main) might be worn enough to be the cause. Many an H or M has had less pressure for years WO issues. So it is your call. The gasoline cap may have a plugged up vent in it causing fuel starvation at an hour into the running. Coils and condensers are also heat sensitive, and prone to cause that symptom. I would see if it has good 1/4" blue spark when it quits before any other diagnosis. JimN
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