I had the same problem and solved it by selling it and buying a Demolet CAI.
A GTS was a 95 GT with cloth seats, no power windows etc..basically a stripped down V6 car but with a V8...
In 96 they offered a version of this car but no longer officially called it GTS but rather a 248A option package. Some call it GTS and don't try to correct them because they will bite your hand off.