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after my intake, my milage increased. To about 325 miles per tank. i have a 3.4 also. I also live in western new york so its pretty cold, but theres been no significant drop in my mpg. i average about 25MPG. Also a friend of mine got the CAI and full exhaust and he also saw an increase in milage. As for your problem billy, i would say check the o2 sensor as stated before and do an all around tune up. see if theres any change.
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