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2007 Express Long Crank

  

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I have 2007 chevrolet express 2500 4.8 without throttle cable.  Having a long crank issue. Although sometimes it will rotate about 1/2  revolution starts fumbling. Then clears up and runs great. There are no codes. changed crank sensor,  cam sensor, AC Delco  gm throttle body,  mass air flow sensor (Delphi), plugs wires ac Delco injectors ACDelco your advice would be greatly appreciated.  Thanks David


2 Answers
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check your fuel pressure


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Topic starter

40psi when switched to on 35 psi while running 


What do the specifications for that vehicle call for?


35 is too low


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