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Old 07-21-2012, 09:14 AM   #56 (permalink)
370ZilverZ
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Did the tuning shop do a compression test? Low compression usually means that you are loosing pressure in the combustion chamber. The two most common reasons for the loss, is leakage around the pistons from scored cylinder walls or and bad rings. The second would be from the cylinder head gasket or valves not sealing properly.
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