Cadillac Seville engine races uncontrollably above 60 mph with foot off the pedal on Cadillac Seville

Some Cadillac Seville owners report experiencing uncontrollable engine racing above 60 mph when their foot is off the accelerator pedal. This issue may stem from a malfunctioning throttle position sensor (TPS), which can incorrectly signal the engine to increase RPM. Additionally, vacuum leaks can lead to unregulated airflow into the engine, exacerbating the problem. Some owners also find that a faulty idle air control valve (IAC) disrupts idle speed control, resulting in erratic RPMs. A sticking accelerator cable may prevent the throttle from returning to its idle position, further contributing to the racing issue. Moreover, problems with the electronic throttle control system can lead to unintended acceleration. It is advisable for owners experiencing these symptoms to have their vehicle inspected by a qualified mechanic to diagnose and address the specific cause, as regular maintenance and timely repairs are crucial for safe operation.