Got a E350 05 5.4L with 170xxx miles no codes/engine light on, been working on a bad misfire in the last couple of days and just notice that driver side is not firing, there is a voltage in Coils, I happened to notice cause I happen to touch it and it was just warm, while the passenger side was hot as hell.. my finger won lie, anyhow, I been reading in so may places some say that cats may be clogged, other than timing I'm really confused about both, when the truck had the problem it happened while getting to a job, it was driving normal and the engine stop running like a missing battery, since then I changed several parts like coils, injectors, sensors etc. any help or even more confusion will be welcome since I'm getting good at both Lol.

 

If you are sure the entire bank is not getting spark, might be a good idea to start looking at the reluctor on the crank pulley to make sure everything is good there . This could be something within the PCM that controls the coil firing only on the non functioning side.