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From what I can tell, that sensor tells the computer the speed of the crankshaft, which controls spark timing and fuel injection. In my particular case, the sensor was putting out a weak signal, which is really weak in starting conditions (low RPM, low battery). The problem was also heat related -- if the engine was cold, it worked fine. If the engine had been running for a while, it worked fine. If the engine had been running, then shut off and sat for about 20 minutes, it wouldn't work until the engine cooled down further.
The actual part is relatively cheap, and replacing it is fairly easy. The hard part in my case was figuring out what the problem was. The tech had to hook up a break out box to the DME in order to track down which sensor was flaking out.
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