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300zx TT running rich

Hi, my 1989 TT seems to be running rich. The fuel economy even for this car is terrible. 10 mpg around town taking it very easy, 15-20 on a run.

 

The car is standard as far as I know apart from Cat-Back stainless steel exhaust system( standra manifold I believe). The 5 inch tailpipe inners are coated with soot. My father pointed this out.

 

Just wondered whether it was an easy jot to tune the car or is an ECU issue???

 

zind

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