I am having a hard time getting the speed and timing right for this song and wondered if anyone had any tips they could give me...I can hit all the notes it just doesn't sound anything like the song. Below is the main riff for it.

A|-----------------------------8-- |

that is the only part I have trouble with really. just can't seem to get a fluid clean sound going. It's one of my favorite songs so I would really like to play it. I just can't seem to get the speed and timing right. I can post a youtube link for the song if that is allowed here. Thanks.