206 1.9 diesel

My 206 Diesel has started to judder as if missfiring when you try to keep at
a constant speed. if you put your foot to the floor its fine or if you
release the throttle all together its fine any ideas??

 

I had this problem , someone suggested the egr unit being st fault, have
temporarly stopped the problem by clamping the vaccumn pipe to the e g r
,,, but I dont know if this in turn will have any effect on any other part
of the engine system.
I have posted the question and hope some one out there can advise me of
any probable effect.

 

Thank you for your reply. I Changed the air flow meter/egr valve and the car
is running fine now.
Only one small snag the new unit cost £99 from local peugeot dealer!!