My 1997 Buick Skylark w/ 188000 sounds like is has the same problems and "multiple misfires" code. I also replaced a number of part before finding a hose that came unplugged.
I think the hose is part of the vacuum system. The hose is badly cracked and showing its age which is probably why it fell off.
It's about 1/2 inch in diameter. It is located in the front of the engine about a foot to the right of the throttle cable connection.
Hope this helps. I will replay again with a picture tonight.
Friday, November 7th, 2008 AT 1:26 PM