a good idea is to check your fuel pressure using the schrader valve underneath and at the front of the fuel rail. between number and number fuel injectors.

it likely isn't fuel pressure but it is easy enough to rule it out.

weak fuel pressure can definitely give you poor performance, poor gas mileage no power on hills and acceleration.

i believe the later 230's......2.4 and 3.l engines spec-ed at 43psi at the rail for fuel pressure.

as a matter of interest my 92 runs at 36-38 psi and appears for the past few years to run properly so perhaps the useful range for psi is bit wider than bentley states.