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I have a 99 LTZ with the 3.8. And I have the same problems as you do.
It might be the coil packs, or possibly dirty fuel injectors. Have you cleaned the throttle body out with with some carb cleaner??
I have been running seafoam cleaner through the system, and it seems to have improved a bit.. Was thinking of just having an injector cleaning done on it. and see what happens.
I live in Chicago, and the rumor is that the refomulated gas that we run in the summer months is hard on the injectors.
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