bad gas milage
i usually make around 13 mpg in my stock 90 GT w/ 114k in NYC. I now make only about 11. The car has fairly new plugs, wires, cap, rotor, fuel filter, air filter. Timing should be good. I was making good mpg after all these items were replaced but recently my mpg has gone done. Any ideas? I was thinking maybe O2 sensor?
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