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Re: '99 Grand Am Problem
Welcome to AF!!
There are three possibilities. One is cheap, one semi expensive the other very expensive. First, check the belt tensioner. It could have gone bad and is causing a knock. Second is the timing chain adjuster. Requires removal of the front cover. Might as well change the timing chain while you are there. Finally, a rod may be knocking. Will require an engine rebuild. Hope this helps!
Good Luck!
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