I'm new to 350z's and fairly new to manuals and have been driving stick for a few months now. recently I've noticed a bit of performance loss compared to when i first bought the Z. recently when I down shift to speed up or am at a high enough rpm to just hit the gas it feels like its almost not fully engaged or slipping. I'm going to do my best to explain this next instance to just hang with me. i was turning a corner and coming around it second gear, pulled out of the turn and hit third and when I was in third it felt sluggish for a second and then it picked up again and shot off which was pretty odd and its been sorta happening more and more. also I know that the Z's are super prone to loudest clutch chatter, when I first got the Z I thought something was broken but did research and found that there's just more clutch chatter because there's less sound deadening material but now the clutch chatter sounds like slapping or like thumping at some times. also the release point on the clutch has been so inconsistent. sometimes it releases high and sometimes it releases low and when starting from a stop it can be super shaky and I can assure its not my driving because its been months and that just now started. looking for help and advise so plz comment back or something. thanks.