I have a 2002 chev auto 4x4 4.8l vortex the truck ran a started fine . The trobl e started after I put brake lines on it just won't start now and don't know why I have checked for fuel have 55 lbs on pressure gauge have spark have replaced the crank sensor checked for broken wires i.e. grounds check every fuse one by one checked the injeftor pulse which is gone the secuity system also fine and just recently replaced PCM Every thing and still no start oh also won't make connection from ob2 and reader but have power