[AwdGSX13]

I did a search and didnt come across and similar posts so here it is, the car is a 1991 talon awd, engine was rebuilt a little under 2000 miles ago with the oil pump replaced. In the morning ill start it and it wont have any oil pressure, if you drive it, it will build oil pressure but if you come to a stop it starts to slowly drop back down to zero. It also isnt all the time it does this sometimes it will be perfect other times ill have zero. Any help is appreciated thanks!