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I'm not sure, but on my 92 I usually heve the Select Moniter hooked up all the time, and whenever I over richen the mixture, say cranking the FPR up to 60 psi or so the light comes on, the Select Moniter says bad O2 sensor. Then I dial down the pressure and clear the code, and the light does not come back on.
With that bad of gas milage you should not be getting the performance that you should. Can you compare it to another svx in your neighborhood?
Maybe you have a restricted exhaust system?
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