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My check engine light comes on every 1-3 weeks. Comes on at start up, not while driving. It is a different code every time. Small leak on emmisions system, large leak on emmisions system, injector 2-3 failed, gas cap failed, low engine temp. My garage can not find any of the indicated problems, and can not explain the random codes. It also sounds like I am draging a chain at 30-40 mph, have tried all different octanes and no change.