2001 GMC Sierra 1500 HD Questions

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last week new tune up (plugs / wires), new air and fuel filter, new fuel regulator
when i turn on key fuel gauge goes to 55 psi and then drops to 0 psi, but when i turn key the rest of the way to start it starts (sometime i crank for 3 sec and stop then start cranking and it starts) then fuel pressure is 48 psi and fluxuates a little when giving it gas
it could be a security anti theft problem, also put in a new key and ignition
This problem is intermittent
truck has new starter , new battery , all fuses have been checked, but when trying to start vehicle nothing happens , lights on dash come on but engine doesnt do anything, what other things can i check for or what might be the issue
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