I don't know who wrote the blurb for this movies - John Candy does not "head up the cast" of this movie unless you consider under a minute of screen time "heading up" the cast. It's not about a jealous husband trying to get his wife back. It's about a gold-digging wife (Stephanie Powers) who sleeps with her exhusband (Anthony Newley) on a regular basis while draining her present husband dry. And setting up a deal to curry political favor by sleeping with the man running for mayor of wherever this city is supposed to be. They can't even get the name right - Anthony Newley's character is "Sweeney" not "Skeet". The photo of John Candy on the box is from a later time, also. It's a young John Candy in the film and he has about 1 minute of screen time.
The drawing power for me was Isaac Hayes and John Candy. Isaac Hayes plays Anthony Newley's buddy/sidekick and he is in the movie for much too short a time. a young John Candy plays a cop in a "blink and you'll miss him" role. So if you thought that pairing would be cool to see, you're probably right, it would be. It didn't happen in this movie.
If you like a long pointless movie about characters you don't care about doing stuff that doesn't make any sense to anyone, this is the movie for you. Especially if you're not a John Candy fan, you probably won't notice he's in the movie. If you want to see something funny with Isaac Hayes or John Candy, keep looking. Almost anything is better than this drivel.