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tbland

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  1. tbland
    1999 GMC Sierra 1500 2-wheel drive 5.3 245,000 miles. Replaced valley cover gasket due to leakage. Replaced Cam sensor because I couldn't get o ring separately. Replaced Oil Pressure sending unit because it looked wet. Now when starting, half of the time it cranks and doesn't start. Starts immediately on the second attempt. Always started first attempt before the gasket repair. Always. Suppose it could be the Cam Sensor? Thanks for any input.
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