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Just going on the information you've provided in the question, it's doubtful that

the engine light is the cause of the deceleration. It's more likely that the light

is correctly indicating the presence of whatever malfunction in the engine is

causing the deceleration, and the engine malfunction is what you need to

identify. Your local friendly mechanic is your best choice.

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Q: What causes the engine to decelerate from a higher speed to a lower speed when the engine light comes on?
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