Hi Guys,
Sorry for delay in writing as i was on my trip.
Anyways i gave my car to 3s dealer and they have finally resolved my problem under power issue was car not properly tuned in that's why engine pickup was not perfect and about a/c cooling coil was leak therefore they asked me to change the coil and i have agreed.
Now ALHAMDULILLAH my car is running awsome and A/C is chilled even in hot days of summer.
last but not the least thanks to all for your valuable suggestion and guidance.
THANKS A BUNDLE (:*)
ZK