clutch drag

Hi all,
I am having a bit of a problem I hope you can help me out with. when I pull in the clutch and put it into gear, it doesn't seem to be completly disengaging the clutch, as it will die unless I give it some gas while it is in gear. I have tried and tried to adjust the cable and have got it better, but not fixed. I have read a lot of posts of people having this problem, but haven't seemed to find a cure, any suggestions?

it will idle all day in neutral, but will die as soon as you put it in gear unless you give it some gas