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It could be a lot of things. The first thing I would check is the fuel filter and the air filter. These are inexpensive and rather easy to replace. I would also have your fuel injectors cleaned, which is also inexpensive. Don't right off low tires either though, as low tires can hurt your gas mileage. If these don't work, then there could be several possibilities. A bad EGR valve could do this, the ECM, or any of the parts of your fuel system.
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