[HotZ28]

You may very well have a bad 02 sensor and that can cause a drivability issue, however, it will not cause stalling when the engine is running and neither will a bad cam position sensor. The 02 only works in closed loop after the engine warms up and it is used to fine-tune the short-term fuel trim (STFT). If the 02 is nonfunctional, the engine may resort to open loop, but not stall. The cam sensor is used for timing the injector pulse to when the intake valve opens. If the sensor is bad, the injectors will continue to fire, but have one chance in six of being in time with valve opening. Symptoms usually include hesitation & stumbling upon acceleration, but not extended engine stalls. As mentioned earlier, check for spark, fuel pressure and injector pulse when the engine stalls.