So today I took my 2012 GT to the dealer. She wasn't feeling well. When I shift to second, sometimes the shifter will stop as though I missed the gear. I'm definitely not missing it. And when it goes in and I release the clutch, the car will hop and sometimes even bark the tires even at low revs. The dealer said it's fine and nothing's wrong, but I know better. Any advice to what could be wrong?

Thanks in advance