Can somebody please help me, my 5.2 is not starting. It started this issue a few days ago, and it's driving me nuts. It act like it wants to start but doesn't, but then it's starts and it last for a day, maybe two and then it doesn't start. I replace the starter and coil. Fuel pump turns on, and the pressure is fine because I smell gas once it doesn't start. PLEASE HELP ME....!!!

 

Need to see what is missing. Fuel, or Spark. Also, need to test fuel pressure, and see what it really is...... Your truck wants about 49PSI at the rail to run right.