[Landseer]

You might be wise to replace the bat ground strap. They are notorious for corrosion beneath the plastic cover. Especially if moisture has gotten into the car, which it seemingly has. Will produce some really oddball, flaky runability issues. Inexpensive. May test at 12V, but not pass enough current, kind of like sand through the neck on an hourglass, then changes character with vibration and as it warms and with varying load.

Injector cleaning also makes sense, but already done? Hmm.

Tide line on panel cannot be good.

Stan, not sure what you mean by CE / Dremel issue? Loosing wire strands in panel? Aren't CE leads brass, not plated?