buddy

After 12 great but challengeing early years I'm about to hit that mark, what are some of the things that need replacing or flushing at this point . I figure coolant, brake fluid, to be the first things though I coolant was done around 45 thousand from Dealer for thermo a water pump issues. Also I still experience the hesitation at higher rpm, even after dealer reprogram of moronic , new coils and plugs injectors cleaned, and no codes set anywhere to be found. I'm wondering do I have a clutch issue , it's a hesitation with a kind of slight buck even at 60 or better if you get down on it. What kind of clutch do I have dual mass , self adjusting single stage I'm not sure as they all seem to come up on my searches. A side from my paint being
Jacked up, this has been one on the greatest purchases in a car that I have made.