Hey, haven't been here for a while. So to refresh, I have a '92 Nissan 240sx hatchback.
I recently changed 2 of my fuel injectors and the fuel pressure regulator. Afterwards, the car idles like crap. The tachometer's rpms at idle go from ~900 to barely stalling, and I am not going to drive much until I get this fixed. It also seems to cause the engine to consume gas like crazy. My guess was that the IAA valve needs to be adjusted or something or is this a problem that will sort out after more driving?

was it happenging before you installed the new parts? Id have to say if it wasnt, then its probably somewhere in a fuel injector not sending enough fuel, or the Fuel regulator isnt flowing enough..

Vacuum leak around the injectors you replaced :dunno:

Try cleaning your MAFS

i would say if you seem to be using alot of fuel, then check your fuel injectors, make sure fuel isnt leaking past the o ring or something, becuase if one injector is leaking your car will run like shit and use more gas that usual