I'm trying to get my car to run as stoich. as possible (rather than lean or rich), and right now it's still quite lean. and that's after installing a new adjustable fuel pressure regulator. what should I upgrade next? the fuel pump? rail? injectors? please help!

 

like I said you should not go by a shitty a/f guage. if you really want to get a wideband and see what the a/f ratio really is. I bet you are running rich as it is.

 

what the hell do you mean a shitty gauge?? it's an autometer Lunar series a/f gauge. i don't know if it gets much better.