Thanks for your updates. I got the codes 4b99 and 438d with stalling and restart fail. Power down wait minute, restart OK. Misread the 4b99 code as injector 2 when it meant bank 2 (aka 4 5 6).
It just got worse, until I couldn't get home.

I had removed the foam when i did intake cleaning and fitting a ccv oil separator which required houses across the top. I didn't notice the crack there until reading the bimmerfest thread: Error code 4B99 and 483D - Bimmerfest - BMW Forums
57 dollars for piece of crap plastic... hmm
I dont trust the replacement even, so this looks interesting Engine compartment bulkhead plastic/rubber partition flexible epoxy repair - Bimmerfest - BMW Forums

Corrosion is funny where issues can crop up a year or 2 later, like we had with hurricane Sandy on underground electric lines exposed to risen salt water.

The other day I took the manifold off and tested the injectors to ground. 1 to 4 beyond meter can read.

6 - one pin 250ohms! Other 20kOhm
5- 150k / 20kOhm

Originally I ordered one injector but luckily the eBay vendor didn't ship yet so I added another to the order. $360 new each, using the Bosch number
0445115077 for search, verifying the pictures and other part numbers for 335d/35d.

Sprayed a bunch of kroil around both injectors to soak for removal. Hopefully they come out easy, then I'll clean the bores with a vacuum and narrow hose. I've done injectors on my past VE TDI, so I'm not concerned. Coding I understand can be done in ista Rheingold.