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So what ended up being the fix for your rich lean codes, because I've got a 92 5sfe throwing them now after replacing motor. Car runs great, lots of power, but check engine light comes on and throws 25 and 26 code for to lean and to rich. Have tried lots of things all with no luck.
-Cleaned Throttle Body (replaced gasket too)
-Tested for air/vacuum leaks (none)
-Replaced fuel pressure regulator on fuel rail
-Replaced Fuel pump and fuel filter due to low fuel pressure
-Adjusted throttle position sensor
-Checked timing (at crank, cams, and distributor)
-Cleaneed spark plugs
-Replaced upstream o2
-Replaced all vacuum lines
Please help if you can
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