Hey guys whats i have a 2000 Silverado 5.3L and if i dont pump the throttle once it wont start have any of you herd of that??

 

Pumping the throttle on EFI motors? Wont that flood the motor? Try doing a tune-up maybe (Plugs,wires). I'm far from a mechanic but thats what i'd do first, and this is just a guess, but maybe fuel pump is getting weak? Just my .02 worth, Jim