1998 buick that i feel have problem

I have a 1998 buick park ave with 74,000 miles , it only a 3.8 liter but it has no leaks , I've just recently had a transmiission mount replaced, but ever since it being strange things like sometimes you'll hear a small sutter sound on the passenger side and if i go up a hill or like a fast take off it sometimes make a kick or knock sound it does them rarely.