Idle air bypass valve cleaning?

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I would only clean one if prepared to buy a new one anyhow. Sometimes cleaning does more harm than good.
 
You can take it completely apart and clean the plunger. I've done it before, but I cant say if it actually helps.

Is your car an automatic? If its a manual, you shouldn't be in gear at that low of RPM, anyway. Does it idle fine in neutral? I don't understand why your car is bucking. A dead IAC usually just whistles, and I can't see it going out at 33XXX miles like it says in your sig.