I had same problem with my 97 Olds Bravada and in this forum found a post back in I belive july that asked the same question and the reply was to tighten the left hand or drivers side hood hinge bolt, it is under the small plastic trim piece remove the trim and tighten the one bolt that holds the hinge to the fender. I tried this and it worked it sounds stupid but it was the best peice of advise I have ever gotten, Thanks to this forum.