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  1. 2nd Gen Engines and Technical Discussion
    I have a 2018 Colorado WT with the i4 2.5 engine with 72,000 miles. A week ago I noticed a very noticeable lag in acceleration (even for this engine which is very laggy) followed by a loud THUMP coming from the rear when the gear engages. It's especially noticeable at low speeds and when in stop...
    engine lag lag thump transmission
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