My car will start quickly in the morning, but will only idle in the 900RPM range at first, then drop to its normal range of 700-750RPM. I find this strange as I would suspect 1100 to a high of 1500RPM. In any case, I shift the car into gear, hit the gas petal, and it stalls. Keep in mind I never allow the car to fully warm up.
Is there a sensor which affect the Fast Idle on this car?

 

On certain models, when the car is started, idle speed may be noticeably higher than normal for a short period, depending on the temperature of the engine.
This has been done to help bring components in the emission control system to their normal operating temperature as quickly as possible, which enables them to function normally.

 

Are my low RPMs the norm? What are your idle RPMs?

 

My car is usually around 1000 for cold start-ups. Duration at this RPM depends on the temp. Not long though, usually less than 15-20 sec....Then it goes down to around 500.

 

With the numbers you've posted, then my stalling is being caused by something. I know that I've replaced one O2 sensor (front bank) and not the other. Do you think that replacing the other O2 could resolve my issue? I hate having to throw money on parts that will not solve/improve the performance.

 

You could be on to somthing.

I heard that the O2 sensor is a very common code that is usually always tied to every error code you get on a car. Tech may be able to verify this....

 

The only problem is that I don't have any codes, just this stalling/hesitation issue. I'm guessing the O2 sensor is failing, but not shot, as the ECU is overcorrecting the fuel mixture.