hi all ,
I have a 01 v70 n/a and when throttle is depressed hot or cold about 20 % the engine shudders. If the pedal is pressed harder it stops or if you lift it stops but it only shudders when accelerating. It has set no codes except one for low catalytic efficiency. any help greatly appreciated.

Hopefully y'all can help. I just replaced my sliding pivots and got the windows reset thanks to this forum; but now my heated mirrors won't work any ideas as to how to rest them. Thanks in advance.