Not good but it spurs a little more motivation

[krazy_texan]

today i got it my truck just like normal to go to class had a couple of errands to run before going home, forgot something at home so went and got it and left again pulled up to a light and noticed the truck was idling a little rough, looked down and i have no oil pressure what so all at idle now when i give it some throttle the pressure is fine. so i thought i have had it on a major road where it was spinning higher rpms so maybe it needs to settle down for a little bit so i left it running while i was in the parts store, like 10 mins come back out and still no oil pressure now i know this aint good so i am going to drive my car to work tonight and this gives me a little more motivation to get that dang 350 built. but any one have any clue what the prob could be, could my oil pump be crapping out on me. oh the engine is a 230 or 250 inline 6 out of a later truck but i am not sure what its from or exactly what it is.