5th Gen intermittent no start

Hello There,
I have a 5th gen SR5 with the V6. It has 238K on it. It has a new challenge.

At times it won't start. The engine will turn over but no ignition. There is no CEL illuminated. After a period of time, 30 -45 minutes, it will start up. Leading me to think it may be related to the below.

It has been happening while running errands or stopping for fuel. It may be heat related as yesterday for the first time it wouldn't start after sitting for over 24 hours and it was about 90 degrees outside.

There is an aftermarket tracking device under the dash. Not sure if this could be creating an issue.

My research is telling me it could be several different items:
The CKP sensor, ECM relay, Neutral safety switch (already replaced that one), Fuel pump or fuel pump relay, Ignition switch Immobilizer (there is no key fob so I think this can be eliminated)

Okay so I've been searching for the location of the ECM relay. What I see in the engine Relay Fuse box relating to the ECM are EFI fuses. No relay with an ECM on it in the directory (Underside of cover). Help please. What does that thing look like?

If anyone has had similar issues with this please shed some light on this for me.