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I also have an '05 TB, and unfortunately had the experience of cylinder misfire (twice already). 73K miles on it...shouldn't be having this issue. But apparently there is a bulletin on GM Motors now stating that the loss of power in the cylinder is due to the poor metal material that was built to hold the valves at the base of the cylinder (to retain the pressure..but it leaks because it is weak). WHY did the idiots use poor quality parts, so the vehicle only lasts 5 yrs.. The repair cost is close to the amount of a new engine due to the refurbishing or just buying a new set of cylinders...THIS IS CRAP....I will never by GM again, and will definitely urge people to stay away also.Report it
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