Ford Mustang intermittent high idle issue due to throttle position sensor failure on Ford Mustang

Some Ford Mustang owners report experiencing intermittent high idle issues potentially caused by a faulty throttle position sensor (TPS). These owners note that a malfunctioning TPS can lead to erratic idle behavior, including high or fluctuating RPM, due to its role in monitoring the throttle valve's position and movement. Symptoms often reported include rough idling, engine surging, stalling, shifting problems, and the illumination of the check engine light. Additionally, some owners have identified that poor idle quality may stem from bad connections with engine electrical connectors. An incorrect part throttle indication at idle can also hinder the vehicle's ability to enter closed throttle RPM control, resulting in high idle. Furthermore, some owners find that unplugging the electronic control module (ECM) and observing a return to base idle may indicate a defective or improperly adjusted TPS. To address these issues, it is advisable for owners to check the TPS for faults or inaccuracies and consider replacing or recalibrating it to resolve the intermittent high idle problem.