Late 80’s or early 90’s action comedy. Title of movie was the main characters last name

An action comedy in the late 80s or early 90s. It was about an ex cop who gets hired by the female mayor to clean up her town. The title of the movie was the main characters last name. I can only remember two parts of the movie unfortunately. The main star was riding around in a limousine with some Cuban gangsters and they were drunkenly singing the song “Guantanamera” and either throwing grenades or sticks of dynamite out the sunroof blowing things up. Later in the film the main star is accosted in the street by a gang member sent to kill him. The punk has a chrome automatic and needs to reload. He is visible nervous and keeps fumbling the job. The star I believe takes the weapon from him and lectures him on why if he is the nervous he should switch to a revolver. If anyone can help with this I would greatly appreciate it. I was looked high and low and have had no luck. Thank you for your time.