I had a similar issue with one of my SR20s, turned out to be a washer underneath the inlet gasket, meaning it was taking too much air in, and water was pissing out.
Water leak, that'll be the ones that run to the stock TB, there must be some disconnected or requiring a pipe to join them?
If its struggling to idle thats got to be vacuum related and idle control valve related? Just noticing in your pictures, there doesnt appear to be a PCV valve connected to the cam cover?
Tact Eddie, tact. Something you have not.