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It could be the infamous poppet valve sticking in the injectors. The scanner I use will show a PO300 random misfire when it is a minor misfire or it will show a PO301 - 308 if the misfire is more severe and specific. I would try running a couple bottles of injector cleaner through it. You will want to use stuff with Techron in it as GM says it is the only type that is effective. The dealer sells it for $20.00, But the same stuff at wal-mart is only $6.00. I use Chevron with Techron and it has cleared mine up. Worn distributor bushings can cause it too, But don't think that is as common. I have 200k on mine and the bushings are still fine although every one is different.
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