09 Pontiac vibe AWD

[Gottyline485]

Hey guys I'm new to this forum but just wanted to see if anyone had or know about this issue I'm having with my vibe. I just bought this vibe last week and I've been driving since and when I first bought it everything seemed good only one thing there was a vibration at idle so my thoughts were maybe motor mounts no really sure though and I've also noticed now that it seems to be making a weird noise not really sure how to explain it but it's when I'm driving down the road only it sounds like something engaging and disengaging from underneath and also like a rattling noise as well any thoughts or ideas would be greatly appreciated