Ok. Before I junk it, I'll ask here. 5.7/4l60. Truck shut off and wouldn't start. Fuel pressure 62 psi, had codes for crank and cam sensor, and no spark. Replaced cap, rotor and coil, IAC valve, cam sensor and now starts right up and revs to 5000rpm then dies. If I disconnect mass airflow sensor it starts then immediately revs to 5000rpm and stays there until I shut it off. No codes present now. Any other direction to go in would be appreciated. Thanks.
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