It should be located at the front under the inner guard. Look up between the bumper and the support panel and you should see it.

Check and if necessary reset the base idle speed. If the stepper motor has been faulty it could be that someone has attempted to get around the problem by adjusting the base idle, and now with the new stepper motor working as it should the idle is all over the place. You could also check the temperature sensor on the fuel-injection system to make sure it’s working correctly and sending out the correct signal.

The TE is an old model and yours has probably done around 200,000 km based on the kays you do annually, so I would be wary of converting it. The modern injection systems are the most efficient, but I doubt you will find one for the TE because of its age. That leaves an old type of mixer/venturi system, which works well and has done for many years. In terms of payback I would think you should recover the cost of installing the system in two to three years.