Acceleration problem on 09 Outlander.
 

Hello, I own an 09 Diesel Outlander with 78,800 miles on the clock. Had the cam belt changed on it last year & since then it's been jumpy when slowing down or in low gear, seems worse in warmer weather. Recently though when on the motorway or a good bit of road where you can put your foot down, when accelerating it is juddering. Sometimes it will eventually boost but other times it has just lost any power & it will limp along even with the acceleration pedal flat to the floor. Stopping & re-starting seems to clear the limp mode but unable to go over 65 mph. No engine management/warning lights show.
Took it to our local garage who plugged it into their diagnostic machine & said 'turbo under boost'. They said maybe a spilt pipe or worst case scenario the turbo, so took it in for further investigation. Came back & said it needed a new turbo as a valve in the turbo was faulty & unable to be repaired.
New turbo apparently fitted & they advised us to drive it steadily for a few days, which we did. All seemed fine until we took it on the motorway & the same thing happened again! Took it back to the garage who plugged it into diagnostic machine again & are now saying it could be the EGR valve, possibly blown by the turbo or blocked. They are currently investigating again!
Just wondered if anyone has had similar problems & what the problem might be?
We find it a bit strange that after having a new turbo we still have the same problem! Did it need a new turbo in the first place, did they actually fit a new turbo & if so would a new turbo cause the EGR valve to blow or block?
Any comments/thoughts or experience of this problem we would be interested to know. Thanks.
08/11 - Diagnosis was blocked catalyst converter veins!

10/11 - Tested the car on the motorway today, all going well until got to 70 mph then speed started dropping, foot flat down on the accelerator & got nothing, limping along again! Judder seems to have gone though!?
Car just doesn't seem to be able to cope with higher speed at motorway pace!? Got off the motorway & pulled into a layby, switched car off & back on, got onto a straight bit of road & on acceleration it then responded!?
Looks like it's back to the garage for us, had enough of it now & it''s dangerous!