Egr,cps
 

Hi everyone!
I just had a diagnostic on my 2006 9-3 1.9 tid linear estate 120hp.
The codes are; airbag sensor, EGR, CPS and low fuel pressure.
Visual check;
Fuel leak at the fuel filter housing, flexipipe busted, and some suspension work.
So started my repair with the EGR valve, fitted a new one. The car start to jerking around 2000rpm when gearing up. I disconnected the EGR and works really fine. Any idea where is the problem?
The next step would be the CPS. I just would like to know how far I have to dig in to change it?

Thx,Joe!