There can be a lot of things that cause a car to run rich. As mentioned a larger fuel pump will obviously make it run more rich. An intake leak will obviously cause it to run rich. O2 sensor as mentioned if fouled will cause the car to run rich. My question is what caused him to think that it is running rich? Spark plugs? Exhaust pipe caked in black as well as the back bumper? O2 voltages? Exhaust smell? Backfiring? I'm just curious.
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