Oil pressure problems

Define "real low"
Normal oil pressure will be high when you first start the engine because the oil is thicker while cold. As the oil warms up it will flow easier and thin out. Thus you get a much lower pressure when the engine is warm. The faster the engine turns the higher the oil pressure will be, because the oil pump turns faster at higher rpm. This is why the oil pressure varies with throttle input.

Basically what you describe is normal behavior, as long as the pressure at idle is around 15-20 psi you are okay. Normally you want to see about 7-10 psi for every 1000 rpm.