Originally Posted by Everest
Yeah it was built with parts that I had left over from other bikes I have worked on and upgraded over time. they all seem perfectly good (except for this problem) and don't see why I should by new parts when good used one that I already have are available. Just for reference it is all Ultegra except cassette, standard front (cranks double), I think I will take it into another more competant shop, I'm starting to think the chain is probably to long. Also it's not cable stretch this was the first ride.
Before replacing the chain try the derailleur adjustment I mentioned in my last post, if you haven't checked and adjusted that yet, and see if that clears up the problem. The derailleur when adjusted correctly will take up the chain slack IF the chain is the right size.