Dealer messed up my H3 even more now

[ASJ]

I got back my car from the dealer yesterday after it was looked at because of some light rattling in the front passenger side. After they told me that they hear it too but can't do anything about it until GM tells them to. What else can I do? Anyway, I got my H3 back and now my pedal starts to vibrate lightly and I can feel it knocking somewhat. I know they pressed the gas and brake pedal at the same time up to 2500 rpm to check out the rattling sound. Would this screw up anything in the H3? I also hear more noise now inside the H3. Anyone have any ideas why i'm getting this noise now?