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1984 Nissan 720 4x4 Poor Gas Mileage

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 O2 sensor (even if you have one) isn't much good to you if you replaced the stock carb.



I would put the original carb back on and see if improvement of not. 


Pull one intake and one exhaust wire off, put a plug in the end, lay on a grounded surface and confirm that you have a spark while cranking the engine with the starter. Both sides need to be firing.


Check valve lash. 0.012" on all


Check ignition timing. 3o BTDC

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