I remember a very short-lived US television series that was broadcast in the early 1990's or late 1980's. It featured a man that moved into a large mansion or castle that happened to be occupied by the ghost of a man that was killed there in the distant past. The man and the ghost became friends, with the ghost frequently helping out or sometimes causing problems - in this respect the show resembled a sitcom and probably is classified as such.
The ghost was unable to leave the mansion for any length of time, or shadowy creatures would attack and try to consume his soul. This may have been due to a curse or something along those lines; I really can't remember. I do recall one specific episode where where the ghost and the man needed to travel somewhere in a small speedboat, while the man used a special kind of vacuum cleaner to suck up the creatures coming after his friend.
This is a bit of a long-shot, but I have exhausted every other resource I can think of for this. It's such a bizarre show, and I can clearly remember watching it in a time slot after Perfect Strangers, but I can't remember any of the characters' names or much of anything else besides what I have provided. I know there were not many episodes made, and I suppose it is possible that it was actually a miniseries.
If anyone can help me out, I'd really appreciate it. This has been driving me crazy for years, and I would hate to think this weird show is a figment of my imagination masquerading as a memory.