truck was starving for gas for 3 miles then died

Hi plz help i changed fuel pump 3 months
ago truck runs fine when its cold i start it it
runs rough till it warms up then its fine.
Today i was leaving work i started fine i
drove about a mile and it was like it was
starving for gas i hit the pedal it would want
to die out i could barley hit gas drove about
3 miles then it died and would start then die
immediatly while i sat with it i left it for 3
hours went back dragged it home now it just
trys to start but wont at all some say ignition
switch some say crank sensor any ideas