I have a 94 bonne se. After the car sits for awhile I have to pull this hose off this peice for the car to engage in drive or reverse. I usually have to let the car run with this hose off for about a min. After i plug it back in it engages. It only does this when the cars sits for an extended period...what can this be????????

That is the pressure control for your transmission. Sounds like something funny is going on with the transmission. how does the fluid look? When was the filter last changed?

i just brought the car about a week ago....I haven't change the filter yet but the transmission fluid looks decent.

That'* pretty odd. Those vacuum accumulators are replacable for about $12. I think I'd take the chance.