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have you checked/cleaned the coolant temp sensor (yellow connector behind fan), and the black one too, clean both. check your MAF connector and clean also. If you have a new style PTU it will be black plastic, with no metal cooling fins.... the older one is metal and had cooling fins on it. clean the connections. I had a similar start and stall problem a few months ago, I cleaned the coolant temp. yellow sensor and next time I drove it it did what you describe... happend once, has not happened again since I cleaned it better with a small wire brush, and used a bit of dielectric grease
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