I also have a buick park avenue and had the same problem had it in the shop and had every test done to it they couldnt seem to find out what the problem was had the battery tested and altenator..said they were both fine. but..the alterator was bad...there is a regulator in it that when it gets hot it drags... anyway i decided to go ahead and spend the 150 bucks for the alternator...and try it its been almost 2 weeks and my car has been starting just fine.......Hope this helps you...
