See Figure 1
The throttle position sensor is mounted in the carburetor body and is used to supply throttle position information to the ECM/PCM. The ECM/PCM memory stores an average of operating conditions with the ideal air/fuel ratios for each of those conditions. When the ECM/PCM receives a signal that indicates throttle position change, it immediately shifts to the last remembered set of operating conditions that resulted in an ideal air/fuel ratio control. The memory is continually being updated during normal operations.