Buick Repair Questions? Ask a Mechanic for Answers ASAP
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The very first thing I would do is clean the throttle housing. Get an old toothbrush (one you don't use or plan on using ever again) When you remove the air filter tube there is a honey comb in there. remove the ring from the outside carefully. Try not to damage honey comb. it should just pull straight out. Now with the key off and out if ignition open throttle by hand and super clean it with carb cleaner and the tooth brush til shiny. Reassemble. The car will likely start real hard. This is OK. Let is idle for 10 minutes or so and it should idle better. You may have to drive it for it to relearn the idle position. See if the other problem went away. let me know the results.