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well the pre cat had never been changed since it was installed at the factory, and that was in 02. the car has 139000 miles. i started noticing issues around 100000 miles, and the mileage got worse, and idling got high, rough starts. mileage was getting worse and at points id through a qtr tank in basically 2 days, only driving 25-30miles. so i thought, yea nows the time to get it done, and i did the plugs too even tho they werent terrible, they were done during september i figured though the hoods open why not do em
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