Z28, did you return the car to the shop to reinstall the hose? I cannot imagine which hose they might have knocked off but, you did give them a chance to fix what you say they broke, didn't you? Or, is it remotely possible the engine might have backfired some time and blew off that vaccuum hose? (If it was a vacuum hose?) In that case - the shop isn't even responsible! And now I'm curious if they gave you a quote or an estimate? I always make sure any work I want done is quoted with a not to exceed price in writing. If they estimated 600 and came in @ 660. I wouldn't be to upset.