86 pontiac 6000 LE stalling at stops with low oil pressure

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!!
Posted using the http://www.autoforumz.com interface, at author's request
Articles individually checked for conformance to usenet standards
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.