1997 Chevy Tahoe turns over won't start

have a 1997 tahoe. 5.7 vortec,fresh rebuild with all new ignitoin parts 3,000 miles ago. ran fine , stopped engine 1 hour later wouldn't start. check of central sfi found it leaking. upgraded system to mfi system for this vehicle. have 58 psi at fuel test port and good spark. any help appreciated, thanks scott PS IF YOU DON'T ANSWER FREE QUESTIONS JUST E-MAIL AND LET ME KNOW. IF YOUR ANSWER HELPS MY PROBLEM EXPECT A DONATION. 2ND REQUEST FOR HELP!!!!!!