Miss-firing Focus

[ncfc99]

I recently changed the cam belt on a x reg 2l 16v focus. Since then it has been missing. It only misses when the throttle is fully open, or at low revs, at about 50-90% throttle, it is fine. Does this mean we have got the timming slightly wrong, or do I have another problem. I have changed the plugs and leads but this has made no improvment.

Thanks in advance for any help.

 

[andyandy2]

Sounds like the camshaft timing might be slightly out