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P0128 GMC -

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will engine misfire if code po128 is active

Vehicle: 1999 Chevrolet suburban 5.7

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P0128 Engine coolant temperature below thermostat regulating temperature

No this will not cause a misfire on this year make and model you can even take out the thermostat, The misfire is a seperate condition misfire are when one or more cylinder are not contributing.

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