I'll be surprised if it turns out to be the crank sensor. when mine was misbehaving (lambda) it would get steadily worse, running rougher and rougher over a few seconds then splutter and die. I wondered about lambda so cut the wires to allow me to simulate intermittent loss of signal. I found that even the most minute loss of signal (I created very quick loss of signal by open circuiting one of the signal wires very rapidly and briefly) - the car would just die instantly when losing signal. My money is still on lambda or tps.
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