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Check engine light came on after rough idle similar to water in fuel.new o2sx4

(1996 Lincoln Town Car)
in Glen Burnie, MD on July 07, 2014
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
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