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Re: crank sensor
While you didn't specify whether the CEL light is on or has been going on-off periodically, you may want to download the codes.
Recently while tinkering with my car, I reproduced your exact symptons of erratic and being unable to idle with the exception that the car always seemed to restart right up. THe ECM was doing this in response to another problem.
In my case, my problem is that the low speed cooling fan continuously runs. OK in summer, but afffects heater in winter. So I removed the relay that controls the fan and took a drive. All was well for about 10 minutes when the CEL came on. It stayed on a minute or two and went off. The CEL would come on and go off like this for the duration of my drive. After this, each time I came to a stop, I discovered the car had rough idle and stalled. Car ran OK, but wouldn't idle right. After 30 minutes of this, and knowing what I did to cause it, I replaced the relay I removed. Engine operation and idle went back to normal.
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