My 91 EX is tcu is messing up, at least thats what i have found to be the problem with searching the threads, i would like to know where the tcu is located exactly, i see a black casing near the ecu, is it inside that casing right next to the firewall?

 

Its going to be located right next to your ecu...on the passenger side jus pull your carpet back and there will be a metal bracket you have to remove...but thats pretty much where your ecu and tcu is located