The ACV sees vacuum on two ports, one is on the intake piping, the other on the front of the plenum. I would first make sure that the ACV is indeed removed and fitted with a plug or at least capped off, and that both ports on the engine are capped. They're very small so you could get engine hesitation without stalling if one was left open, but it'd be pretty noticeable when inspecting.
The amount of fluid sucked into the intake won't make a huge difference, it's already gummed up from years of debris so unless you took in a few gallons at once that's not the culprit, though I wouldn't ignore the idea of hot tanking the intake plenum anyway (I just did a timing belt on an SC400 with 277k miles, the intake was literally caked with over a half inch of carbon and deposits).
As for the steering, regular PS fluid is known to cause dead spots or heavy steering as it breaks down faster from heat, and it degrades quickly leaving varnish in the lines and hoses. But again it wouldn't happen that quickly, probably a combination of air in the system and a weak or faulty pump is your issue.