Hello everyone,
It's been long time now.. my issue has been resolved of fluctuation of rpm / ac compressor tripping.
1) I changed TP sensor again (kabuli). So actually it was TP sensor fault.. the one I purchased was also not correct. But asked mechanic to purchase it for me which worked.
2) Distributor was faulty ( found crack on the inside plastic) and the magnet was not working correctly (checked by mechanic)
3) Fuel Pump changed (in every six months I had to change it and was not less than the pain in the ass). So, detected fault in wire clips.. removed it's wiring clip (direct wiring done found beneath the back seat) which was causing faulty issue of low rpm on first few seconds of acceleration plus the everytime fault of fuel pump has been resolved (it's been a while now.
Due to above changes now my ac also works fine without tripping in hot weather.. in hot temperature don't forget to pour water on the compressor/condenser with some pressure.
The only thing left is high rpm on cold engine as my radiator fan is direct therefore, it will work like this for first few seconds so I have accepted the fate of this car.. otherwise I have to change the whole wiring. My electrician tried to make it work but it didn't work for long time and resulted in heating of car.