Dies, sometimes won't start

[artc]

OK,

96ti Active 5-speed
DASC
Brospeed exhaust
Stock software -- not chipped

240,000 miles

A couple months ago, after it's annual tune up at Schneller
Motorports, ace tuners who have been maintaining it for 7-8 years or
so, the car started do a sputter or hesitation, then it would run for
a minute or two and then die. Felt like running out of gas.
At the tune up, the coil was replaced, and they noticed a couple of
"rodent-chewed wires" that were also replaced.

Did it when cold a couple times and when warm several times. An odd
smell was noticable, not the rotten eggs of the cat with a snoot full
of rich vapor from WFO acceleration, but something unusual. Cranked
over fine, but no spark / no start.

Car would restart after "resting" some period of time (usually when
being offloaded from the flatbed at the garage.)

Appeared not be getting either spark or gas. No diag codes at all.

First mechanic (not Schneller) diagnosed and replaced the crank
position sensor. No change.

Schneller first thought it was the fuel pump. Replaced that.
No joy.

Next suspect was the computer. Swapped out with one from an automatic,
it seemed to run OK, but displayed a constant check-engine light.
Found and tried a replacement from a 5-speed, and the problem recurred.

Since then, after a few more failures, tows, and work, they determined that while "failed," the fuel was flowing, but spark was not. The cam sensor was replaced, crank position sensor was checked again, and the ignition switch was replaced.

Ran fine for 3 days / 200 miles. Died, and won't restart.

Any thoughts from the collective mind?

Thanks in advance!

Art

[aceyx]

Ignition wires/coil pack? 240k is a LOT! Congrats on getting it that far.

[artc]

Nope, those are both fresh... put in as part of normal maintenance, although the problem didn't exist until the new coil was installed. Since then though, another coil was swapped in, so it doesn't seem to be that.

Also, there's no electrical going to any of the plugs, so it's upstream somewhere...

Only other odd detail is that there are no error codes. None.

Art

[Mallard]

check the ews coil around the key hole if it has one, also the condition of the key

have a good look at the dasc, but im sure if its been under previous inspection it shouldnt be related but check anyway

[aceyx]

Any other unusual electrical problems?