Update : The Poor ideling C200

[mevans]

So I replaced the MAF and still had all the problems so decided to do the bad home mechanic thing last night and start disconnecting systems to see wether it improved it/made it worse. Nothing worked until I pulled the vacuum pipe on the evap system then all of a sudden it starts to idle properly and drives much better. So im assuming its either a blocked evap canister or the little pump/valve in the system thats knackered. Im assuming I can get the canister from my local motor factors but do I need to go to Mercedes for the pump/valve thing?

Thanks guys

Mat