Keep your Z and fix it and enjoy it! This shop your dealing with either has no idea or clue about our cars or their business practices are dishonest. Definitely choice a new shop to repair your Z at there has to be someone near you that has some experience with VQ platform or at least has some experience working on Nissan/Infiniti vehicles. First areas to consider looking into would be a compression check and leak down test.
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Mr. Clean
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