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Aaron gives good advice, but I would recommend something to try first. Try replacing the oil pressure switch and see if that fixes it. Most likely, the oil pump is fine, and I would say most likely, the engine internals are okay, but if this is a real oil pressure problem (and not a faulty switch), the bearing surfaces would probably be the culprit. But sometimes, if the wrong oil pressure sender was installed, or the one that's in there is getting lazy, it can be just on the threshold of showing "low pressure" when the pressures are indeed lower, at idle. I'd try changing the sending unit first. It's probably only a few bucks (it's about $6.50 for my '95 pickup) at the auto parts store and can tell you pretty quickly if you have a real problem or it's just a problem with the switch.
Good luck,
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