misfire and belt noise on start up

[vectragsi3.2]

hi
i have a 3.2 gsi and just recently when i start it up in the morning it is very juddery and when you rev it it sounds like it is misfiring. also i have a sound which sounds like a belt going round and has a very small squeak also. its hard to described!! i have just had the cam belt done so im worried it could be something to with that?

hope someone can help

[Big Sig]

More than likely its the serpentine drive belt - the one that does your A/C, alternator etc thats squeeking. Not sure on the rough running. Does it get better when it warms up? Maybe a coil pack on one bank starting to fail

[vectragsi3.2]

its fine when it gets warmed up. when its cold it judders everytime i change gear and the accelerator does the same when you tounch it. but like i say when its warm its fine apart from the belt noise