Ford: 351 windsor wont start, mass air meter, 351 windsor

Question
I have a 351 and it started losing power then would only run when cold now just misses like no fuel or timing off and only starts occasionally. when it runs it misses.
I checked timing (good) fuel in rail (good) spark (good) but will not stay running?????
Any ideas would help

Answer
Have you tried checking the idle air bypass or the mass air meter? What year is the vehicle? or more importantly what year is the ecm and is it a mass air vehicle? try cracking the throttle just a little. make sure the ecm relay is functioning properly. check for power at the injectors... also try using starting fluid. (Spray) that will help you narrow it down a little. let me know the additional info and we can try to get this figured out....