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September 20, 2022 at 8:55 am #1001960
Often overlooked is the mechanical condition of the engine. Even though you replaced the long block there could still be issues. I would recommend starting with a compression test and if you find low compression in one of the cylinders, follow up with a leak down test. I would also recommend checking the timing components to make sure they are secure and in time. If you’re off a tooth, or if the timing components are loose it can cause a misfire. That way you can rule out a mechanical issue as the cause of the problem.
More info here: http://www.ericthecarguy.com/faq/solving-automotive-performance-issues