Why does your 1991 mercury capri xr2 idle weird?

A 1991 Mercury Capri XR2 may idle weird due to several potential issues, such as a vacuum leak, a malfunctioning idle air control valve, or dirty fuel injectors. Additionally, problems with the spark plugs or ignition system could cause irregular idling. It's also worth checking for any error codes if the check engine light is on, as these can provide clues to the underlying issue. Regular maintenance and inspection can help identify and resolve these problems.