Hello again, a few months ago I had an issue with my ignition module causing no-spark, and thought I had it sorted, but again I'm not so sure.
So, today while in a drive-through my wagon started to freak out and die, then come back, then die. I had the shame of having to clear out the drive-through so I could push my wagon out of it, then spent a few hours in the parking lot trying to figure out what went wrong. The symptoms are the same as before, where the car will run a little bit and then "freak out" with the engine violently shaking and dying. When it dies I usually smell fuel, and hear the injectors firing in it's last moments before death.
The module I replaced my HUCO one with is a Bosch unit that was brand new and it only made it about 1000 miles before issues. I had the car towed 90 miles home (thanks AAA), and like before it sits and runs just fine and I can't replicate the failure.
So this is a tough one to ask for advice on. What should I do now or look at? I won't be able to get to this thing for a couple weeks (but will visit it on weekends until school is out). I did confirm my in-tank pump was not working properly but it is drawing current. For that I removed the hoses and ran the car until it was starved of fuel, and it did not pump any fuel out. This makes sense why my newer Bosch pump was weezing... But this problem should be unrelated.
The car has a "new" ECU from a non-turbo 940 to replace the 516 "pink label" ECU, and I swapped the fuel relay along with manually jumpering it when the car was dying and freaking out, same as before with no results either way. Wires, cap, and rotor are pretty new along with the plugs, but I will check again. It's just a very annoying and difficult problem to track.
As I mentioned the car is 90 miles away so I will be visiting it and not actively working on it through the week, but I appreciate any pointers to set me off in the right direction. This car has 64k miles on the clock, one owner, and breaks down more than cars I know with 300k + miles. I love it dearly but man, it's been a long day.