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I take it that if you can say for sure that the hoses are ok then you have the car somewhere that you can work on it. (Hose leaks are easy to miss). So now I would take a compression test on each cylinder, they all should read 150-170 lbs. If one or more cylinders varies from this you could have major problems and should at least figure on pulling the head. If all cylinders show good compression look at the plugs you pulled. If they are carboned up, sooty, and fouled then look once again carefully at the turbo hoses.
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