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There can be several causes. If the "check engine" light is on, the computer has detected the problem and has information for you but you'll need to use a code scanner. (rent, borrow or buy one from your local auto parts retailer)

If the check engine light does NOT come on, it's probably a fuel problem since auto manufacturers don't want to start throwing codes when you run out of fuel.

If you know that you AREN'T out of fuel, check the fuel pressure at the rail. There should be a fuel pressure test port where you can connect a fuel pressure gauge. If the fuel pressure is low, your engine will not be getting sufficient fuel and will run poorly.

Low fuel pressure can be caused by a worn fuel pump, a partially clogged fuel filter or a defective fuel pressure regulator.

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