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What causes a 2004 hummer h2 to surge at 45 mph?

* Transmission fluid level is low.

* Transmission filter is dirty.

* TPS is dirty or needs adjusting.

* O2 sensor is faulty or dirty.

* Fuel filter is dirty.

* Spark plugs are worn out.

* Ignition coil is faulty or misfiring.

* Fuel injector is clogged.

* Vacuum leak.

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