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A 1993 year old Cherokee, equipped with 6 cylinder EFI engine. The engine is tempered seriously when the vehicle is running, and the speed is not tempered only when the speed is below 2000r / min. When the engine speed is more than 2000r / min, both rapid and slow acceleration, the engine will be tempered, the higher the speed, the faster the tempering frequency, and the engine speed can not rise to more than 4000R / min.