Don't confuse what is needed for an engine to run with what is required by the EPA emission standards.
Generally, a throttle position sensor and ignition timing control/sensor are the minimum. Run well? not necessarily.
Remember that current automobile systems often do not have a mechanical throttle valve connected to the accelerator pedal. They rely on "the computer" to set
fuel, timing, and air flow, based upon the pedal position and other measurable operational conditions.