oXeNo

I got a b20b, It has ran fine and everything just for some reason when my oil was low when I would let it idle it would drop down to almost stalling out then going back up, the oil pressure light would come on for just a second then go off. I put more oil in it, it fixed that problem now my idle goes down and its extremely low and my car is running terrible, If I sit somewhere for just a few minutes and then try and drive somewhere it is extremely sluggish until I just stomp it and take it up into higher rpms. That almost feels like a fuel problem but I just changed the fuel filter, different set of injectors and adjusted the fuel pressure. Do you think it could be the oil pump going out or something? I had just gotten my idle fixed a week or 2 ago and now its doing all this.