97 F150/4.2 V6/Cranks but will not start!
 

I drove my truck home from work one day, turned it off.
And the next day it would start.

OK. Now, does it turn over like it wants to start?(makes noise) Have you seen if there is any spark? Have you checked for fuel getting to the engine? Check all fuses first. Listen for fuel pump to run for a couple of seconds when the key is firstr turned on. Check to see if ther is blue spark getting through the plug. Help us by checking these things and let us know.