Cefiro A33 Loss of power
 

Greetings,
I am from Sri Lanka and I drive an A33 2.0G. It was running fine and engine was very good. 85000km.

Recently while I was driving fast, I noticed some power loss and the check engine light came. I pulled away and took it to an engine scan. It showed something wrong with Ignition coils and I replaced all 6 (no check engine light now). Still the engine has not got enough power to even climb a small hill. I have switch off the AC to make it pulling. Also I hear some "Popping" noise from the engine (kind of backfire).

What can be the reason?

Can it be the fuel pump?

Cheers,
Harsha