86 pontiac 6000 LE stalling at stops with low oil pressure

hi,
I have a 1986 Pontiac LE 2 door and it likes to stall when coming to a stop.
when i start the car and drive it for abut 15 mins the oil pressure is
high but soon after when i make several stops, the oil pressure goes low. and then i start stalling at stops. I put it into neutral and it starts back up again no problem
Why is that?
thank you!!
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