1995 c280 Questions/Problems

My dad just got me a 1995 c280 since I sold my last car, so this is really my "first car" in terms of being fancy. However, I have been a car kid for about 6 years now, and I have about 7 cars total. This is my "daily driver" though, as the rest of my cars are classic/classic muscles. This car is having some problems though, wondering if you guys know what they are...

Whenever the air/heat is on, the car is boggy and hesitates when you give it throttle in every gear starting off, it is EXTREMELY bad in first gear where it almost seems like it is going to die.

Whenever the air is off, it just hesitates badly in first and second gears.

Also, I was wondering, I know this is a "luxery sedan" or whatever and it is made to look/ride good, but is there any performance pieces to get some extra juice out of this thing? Like a supercharger or turbocharger :eek7: ? :rolleyes: It would be nice to have a Benz that not only rides/looks good, but can back it up with a little bit more power.

Thanks.