I've seen a lot of third gen's like this...My spoiler tilts up on one end like whatever adhesive was used just wore off, what should I do to fix this?

 

'lil you can do to fix it permanently. Very common problem with our cars. Some members here have successfully glued their edges down. I once got a quote from a body shop for $100 to do that. Never got it done.

 

its caused from the metal inside the spoiler rusting out and causing the spoiler to seperate from the tabs that hold it down. Some have glued it back down but my suggestion is to take it off and put an aftermarket fiberglas/plastic factory replacement on. The rust from the spoiler will eventually (if it hasnt already) spread to your trunk lid and it will rust as well. That is why I suggest replacing it and taking care of both problems.