I disconnected only the brown tcc solenoid wire. It made the "chuggle" during shifts go away for the remainder of that day. However, the next day it seems like it's back, and the tach which was stuck at zero is now bouncing everywhere like a madman.
The tach is supposed to be controlled only by the crankshaft position sensor, but I replaced both of those and it is still doing this. There must be some other part interfering with the tach signal.
I'm not sure what's wrong at this point. This car has a terrible electrical system.
