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Q: what causes the fuel to run to rich? i have replaced the starter,fuel pump,and on 1991 Oldsmobile Cutlass Ciera

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
cat.converter. will run for a while then die. a mechanic told me that the gas is running to rich and might be an electrical problem?? any help??
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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First guess it would be an O2 sensor.
It would appear you are willing to spend this amount of money and not fix it. What the hell replace the O2.
I'm sorry, Take it to a PROFESSIONAL AUTO TECH (PAT) to look at the serial data stream.
Stop wasting money!
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