Most likely on a label inside the center console.
It was an RPO code for a sport suspension package.
Code 23 is manifold air temperature.
Go to the dealership and they will do it for you.
Trouble code P0174 means:System too lean (bank 2)
theres a sticker in the glove box with the option codes the paint code is in the rt lower corner
Should be on the RPO sticker inside the arm rest console.
the best way to get the paint code is to call a Chevrolet dealer ask them and give them your vin number.
Code 23 is manifold air temperature. You need to have a shop diagnosis the problem so that you do not replace good parts.
Have the system scanned for codes. Make the necessary repairs andthen have the code cleared using a scanner.
Underside of the trunk lid. will show a U or WA and then the paint code. If your car is two toned it will also have a L (lower).
The paint color for a 1991 burgundy colored Ford mustang LX is medium red. The code color is EM.
Look under hood against firewall - should be a plate with paint codes