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Q: check engine light came on after rough idle similar to water in fuel.new o2sx4 on 1996 Lincoln Town Car

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
new cat converter,throttle position sen,air filterand cleaned throttle body.car has power just a really rough idle to point I have to put in netrual.i use premium gas and put stp fuel conditioner in.no rich gas smell.could a throttle body get dirty that fast?does'nt explain check engine light.thanks for the last fix professor.please help
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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