Hi all I got a 2006 Volvo s40 t5 I replaced my cam belt but my car isn't ideling like it should. Any advise

 

Remove your cambelt cover and also spark plug from No.1 cylinder.
Turn her over by slowly by hand until No.1 piston is at top of stroke. TDC. Check visually.
Check your timing marks for the cam and crankshaft pulleys are still all correctly aligned.
Sometimes the timing belt slips over one tooth or the cam pulleys move slightly when fitting the new belt affecting the timing.

 

Did you do any other work besides the belt? Stuff like new plugs or coils? Did you mess with the throttle body?