Help with Persona loss of Torque pls

[markhammill]

My Proton Persona SRI used to have a lot of power.

Now if it is not going very fast and you accelerate or if you change up when the revs are below 4000 the car juders and there is no power there.

It seems to be misfiring.

The garage thought it was the leads so I replaced them but it hasn't helped.

I have also replaced the spark plugs.

Could it be the fuel filter maybe.

Any ideas would be great.

My friend has the same problem with his Nissan 100nx so I don't think it is an unusual fault.

 

[lix]

You could go to Proton Service Ctr and have the car fully check and may be can re-set your ecu.
Just my 2 cents :P