'90 8v 740 is still getting around 13 MPG. I've been getting the 213,
232, and 231 error codes. Idle still seems jumpy, lack of power, and i get a strange blip at 1200 rpms whenever the engine is slowing from 2000 rpms. Thus far, I've...-replaced O2 sensor
-replaced Fuel Pressure Regulator
-replaced sparks, cap, and rotor
-spark cables ok
-cleaned and resecured ground connections
-checked proper voltages coming from ECT
-No vacuum leaks (ACTUALLY, I just found a disconnected vacuum hose at the charcoal can. Surely this wont do anythign!?)
-No exhaust leaks
-AMM appears to be fine (car nearly dies when you unplug it)
-TPS adjusted properly
-Idle control valve cleaned
-All fuses fine
I'm about ready to give up and am hoping somebody has some guidance or suggestions.....