Saturn SC1 idle failure causing stalling while idling on Saturn SC1

Some Saturn SC1 owners report experiencing idle failure that leads to stalling while idling, which may be caused by defective oxygen or mass airflow sensors, a stuck open EGR valve, or fouled spark plugs. Symptoms reported include engine stalling or near-stalling while driving, rough idling, and a noticeable decrease in engine performance. Additionally, some owners have experienced their cars cutting off while driving at a constant speed or idling at a stoplight, along with starting and idling problems, particularly in damp or cold weather. High idle RPMs ranging from 2350 to 3500 in park and neutral, as well as intermittent stalling shortly after start-up or after a few minutes of driving, have also been noted. Diagnostic steps taken by some owners include replacing the throttle position sensor, idle air control valve, and coolant temperature sensor, as well as changing the fuel pump and fuel filter. It is recommended that owners address OBDII code P1599 promptly and seek professional assistance if DIY attempts do not resolve the issue, considering checking and potentially replacing various components to effectively tackle idle failure and stalling problems.