92 f150 starting problem

92 f150 intermittenly fails to start. happens only when warm. once running it runs fine. have replaced ECM. any Ideas? thanx.

you should ck for parrisetic drain and excessive voltage drop in the battery wires and starter soliniod provided the battery is good

I have the same problem. My 87 F150 won't crank once it has been driven and has warmed up. After sitting awhile, I can start it. What is parisitic drain? How do you check for parisitic drain? How do you fix this when found?