Chain skip

Hi, i fitted a new sram chain a few days ago and i now have a severe case of chain slip. Im using an 8 speed shimano cassette which is virtualy new and my deore derailler is fine. I also have a Da Bomb chain guide which doesnt seem to be interfering with the chain at all. I initially thought the chain was too long so i have removed 4 links but that doesnt seem to have done alot. Shifting up or down the gears is normal. Any ideas?
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also what is the rest of the kit and what else have you changed and why did you change the chain in the first place?
Parktools :?:SheldonBrown
If the cassette is almost new that shouldn't be the problem, unless the old chain was very badly worn & wore the cassette to match.