I changed the valve cover gasket the other day and it is definately not in the plastic 90 degree fitting that goes into the valve cover. Also has not fallen into the valve cover. I checked the other end of the hose where it attaches to the TBI and it isn't there either. A couple people told me their truck doesn't have one either - all '91 or newer. 1991 was the first year for the "A" code engine so that might have something to do with it too. I contacted GM but they said they needed my VIN number to tell me for sure. So far I haven't remembered to bring it to work yet where I have internet access.loweredd said:Did you find it? There is the hose that runs from the TB to the valve cover. Pull the hose off of the 90* elbow that is on the valve cover, and it's in there.