Question about 1998 Buick Century
This can be caused from a drity throtlebody or bad idle air control valve, start by making sure the throtle is clean then have the idle air valve checked, when starting the valve should open to raise idle and drop down after it starts, it sounds like your doing what the valve should be doing, hope this helps.
Posted on Sep 05, 2010
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Posted on Jan 02, 2017
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