Ihad this problem with a 1998 GL with the 3.8L V6 and 100000 miles on it. Check and see if you have proper vacuum at the intake runner manifold actuators. They are on the passenger side of the engine around the alternator. You can pull off the vacuum line and use your finger to plug the hole and see if it holds. If not you have a vacuum leak that can cause your issue.
You can pick up them up at a junk yard for cheap as the dealer will charge an arm and a leg. Make sure to get the little white plastic bushing from the dealer though. If changing one or both it is easier to remove the alternator as it is in the way of the screws holding it on.
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Monday, December 18th, 2006 AT 7:45 PM