ok first things first. please enter your car information in your sig so we all dont have to ask the following questions:
-what model and trim car do you have?
-what year?
-any modifications to it?
-if yours is a 97 it could have a vaccum controled trany.
my money is on a vac leak though. is this a NA or SC car? id assume SC cause you are saying you need to be on 93.
does it look like there were any mods done to it?