I recently changed cap & rotor button, spark plugs and wires on my truck. It was running good. The next day it would not start at all. I kept trying and trying then I noticed the hose from my airbox to my throttle body was not connected. Put that on and still nothing. Then it started. I drove it down the road to work and when I went to check on it, it wouldn't start again. I work at a parts store so I started trying stuff. I put a TPS sensor on it which took forever and it started. Problem fixed. Nope. Took off the next day for work and stopped at a gas station and it wouldn't start back up. So I put a pickup module on it and still nothing. Every now and then it will start up and run and run forever if you dont shut it off. Fuel pump is working. I'm getting spark. I have no idea what it could be. Thanks

 

coolant temp sensor switch > middle one, mine went bad was stuck on a cold cycle and would foul plugs 177 new, but cheap at a pick n pull