So I ended up resolving a bunch of my issues by playing with the neutral position sensor and the 'manual identification pin'. Now I've got a relay basically inverting the operation of the NPS because mine is a legacy trans and it's backwards, and the car drives like a standard should drive from the factory. Mostly.
When I engine brake, the rpms are somewhat sustained thanks to the transmission, despite zero throttle input. Without a vehicle speed signal, I believe the ecu interprets the higher than idle rpms as an issue with the idle air control valve. It throws a 1508 (IACV) and tries to stall out when I clutch in after long periods of engine braking because it's trying to close the IACV as much as it can, which it turns out is enough to stall the car. Anyways, it's PERFECT if I don't engine brake.
...And I need to get rid of it. I found what I hope to be my forever daily:
1997 Legacy GT Sedan 5MT in Rio Red.
It's so clean. It's the cleanest car I've ever had! Look at those arches!
Underneath is immaculate, at least for New England. I bought it in Mass with 187k for only $500! It needs a windshield, tires, and head gaskets to be daily-able.
BUT! It comes on adjustable coilovers and has the perfect gearset IMHO.
I'm just so excited about this car! You know
I'll be turboing it. The engines formerly meant for my '95 coupe will now go into this car, and the '95 will again have H6 goodness!
This time I'm definitely gonna turbo that H6!
Anyway, gotta thin the heard so if none of my friends want the bugeye, it'll be on here cheap. Sure it needs work, but it runs great and doesn't even leak.
Plans for the LGT include a new windshield, tires, GOLD rims, lower, and boost. I can't wait!