A.O.A. guys i have honda city 2007 model idsi. now the problem is my car engine power is reduced on constant drive i can feel a little but frequent engine knocking and my car acceleration is like it is getting acceleration in bits( rook rook ker). with air con ON engine lose alots of power. engine oil level is fine. no heating issue air filter is cleaned. but i have changed the fuel pump/fuel filter bcz it was choked due to bad/dirty fuel.so i guess it might be valve or fuel injection issue or maybe current issue!! can anybody pls assist me in this matter.