And the ground points under the hood, and near the coils ? I ask because my engine ground looks 10x worse that that (Dusty, gray ..)

FWIW I had mystery issues; it was the ignition switch.

 

Ok. So, you are chasing gremlins.

Nevertheless, your ground straps are almost perfect.

Assuming your description of the randomness of the symptoms is reasonably precise, I would, first, suspect the branch of the engine harness that connects to the speed/flywheel sensor to the EZF.... but, only if I knew for a fact that the battery was fully charged every time I did a test.

 

That rear earth looks good ... as does your engine earth and CE panel ... that leaves other earths to check in the basic circuits, but considering the good condition of everything else, that's not seeming likely.

Ignition switch could be the culprit as it's switching supply to all those systems ... and that about covers most of the basics .. and it would seem unlikely that you'd have multiple relays go intermittent at the same time.

You're left with electronics and sensor faults ... I'm sure someone who's expert in that area might be able to point the finger at something which is typical for those intermittent symptoms.

Edit: just saw worfs post

 

Never ever turn over your CE panel and look at the wires, you take the risk of turning to stone.

 

We've seen several other intermittent running / stalling / no start situations caused by that harness on other cars. What a critical piece, along with its connections and grounds.

Also, with all due respect, that rear groundstrap shows a corrosion pattern which looks like that which "took down" three different cars here. First intermittently, then completely. Exactly the symptoms described. No question about the source.

However, the third case also had a ground problem on the harness mentioned. We found it later. But replacement of groundstrap was needed because it caused car to go dead as door nail, electrically, despite 12+ V across battery. (That car sat 10 years and had multiple issues. Moisture collecting at the body side of groundstrap. Mice peeing on the engine harness grounds.)




Engine block ground looks great though.

 

Can you be more specific ? Will the car crank over at good rpm ? Do you have spark ?

The main electronics ground is at the back of the engine under the engine airfiltor box. Ground point MPIX Location shown in WSM