the TFI module is called a Thick Film Ignition module, what this does is control the spark output to your distributor. It was a huge recall on alot of ford vehicles because they used to be located directly on the distributor where most of the engine heat is, hence why it is now near your air filter. What would happen to these modules is the film inside would dry out causing condensation to get on the controls and short the module out causing complete power loss of power breaks, power steering and the like, it happened to my 95 GTS and it is scary stuff, almost caused me a few close calls
1995 MUSTANG GTS
FMPP 3:73's, FMPP Aluminum driveshaft, Dynomax 1 5/8 ceramic coated short tube headers, Borla cat-back exhaust with side pipes and CUSTOM OFF_ROAD X-PIPE, Advanced timing (12 degrees), Taylor 8mm wires, Bosch Platinum plugs, K&N air filter, SVO side skirts, White face gauges, PRO 5.0 shifter, Eibach sport line 2" lower, Center force stage 1 clutch assembly, Detailed Engine, Detailed Interior, 245/50/16 tires all around. Alpine Alarm system.
SOON TO COME: Clear Tail Lights, saleen front bumper, saleen hood