91 buick century 3.3l v6 running rough, code 26 and 48

1991 BUICK CENTURY
90,000 MILES
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IGLOWINTHEDARK2
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I have a 91 buick century 3.3l v6 that's running rough, has lost a good bit of its gas mileage and is giving me codes 26 and 48. The check engine light doesn't come on til after the car has gotten up to a warmer temperature, even faster on hot days, even slower on cold days

any idea what it might be?
Oct 11, 2013 at 1:47 PM
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JDL
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The code 26 is for quad driver circuit. The code 48 is misfire diagnosis. How long since a tune-up? Replacing the 02 sensor is part of tune-up.
Oct 11, 2013 at 2:31 PM
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JDL
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This is for the code 26--A body.
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Oct 11, 2013 at 2:38 PM
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