1987 ford Ranger XLT 2.9 V6 Auto wont start
 

i hae an old 87 ranger and it ran great and drove great for years. i get a job flipping burgers at wendys ( i am 16) and i come out of my first official day of work and my truck wont start. turns over but wont fire. so i calll and my step dad comes and3 tows me home. still wont start. put a new cap rotor and plug wire in it and it fires right up and runs like a dream. go to my second day of work. drive their runs great. come out of my secod day of work. and it does the same thing. i havbe put an ignition module in it with no solution. it has no spark. cant fuigure out why. help please. stareted thinking about comnputer today.