The TFI is a distributor mounted ignition module. If you have the distributorless ignition system you don´t have a TFI module. My Car doese the exact same thing though. I will punch it, and it will barely accelerate untill it passes 3 grand. I put a new Ignition module, and an MSD box (Not just the coil, but the actual MSD ignition 6AL box) And it seemed to help at first, but after a few days it came back. I doubt it is the TPS, since it happenens when it is floored, but it does eventually catch up to itself. If this were to happen an a carburated car you would check the accelerator pump, and the secondary jets to make sure you weren´t getting too lean or rich when you first step into it. But since our cars are Fuel injected there isn´t much we can do to change the Wide Open Throttle fuel map.
And as far as adjusting the TPS goes, I´m pretty sure the Escorts are non adjustable. Easy fix with a drill though. just lengthen the two mounting holes, and you will be able to adjust it. To check it find the signal return wire (There should be 3 wires, ground, signal, signal return or signal reference) The signal wire should be around 5v, and the return wire should be just under 1v. The higher the return voltage the wider the computer thinks the throttle is. Try setting it to around .9-.98v. If you go to high the engine will run rich at part throttle, but if you go too low the computer won´t know when you are wide open.