Engine Performance problem
1998 Buick Century 6 cyl Automatic
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my wife has a 98 buick century. it goes through a tank of gas in about 36 hours. after it gets below 3/4 tank it usually doesn't last very long. i got 2 dianogstic codes 0442 and 1441. i know what the code 0442 is for. what should I check for first. I've replaced the gas cap and changed my plugs,wires, and airfilter, and fuel filter