Does a 1991 Chevy Caprice have an automatic choke?

Yes, a 1991 Chevy Caprice, with its carburetor (if it has one; some had fuel injection), would have an automatic choke. However, it's important to note that by 1991, fuel injection was becoming more common, and some Caprices of that year may have had electronic fuel injection instead of a carburetor and thus would *not* have a traditional automatic choke.