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Re: 02 impala gas mileage
Might want to check to be certain your throttlebody is clean butterfly and intake horn. check carefully for vacuum lines cracked or dry rot...I also agree with the previous regarding the plugs and a good time to check plug wire resistance. Using the same pump at fill-ups ? I wouldn't be too concerned about the o2 sensor just yet nor coil packs for that matter. Alternator could be running under load more often if battery is getting old and weaker.
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