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If you say all the hoses and clamps are in good order, then the only other things that come to mind are the wastegate and exhaust manifold. Either the wastegate is opening too soon, or the exhaust manifold is leaking from the gasket or a crack. This would mean that either you lose boost too early, or you never get enough boost in the first place. Or, if ...


Have you checked your transmission oil level? Low oil level could cause your symptoms. Whilst checking your oil level is there any water contamination? Coolant can get into trans fluid from the trans-oil cooler. You need to let your vehicle repairer carry out an examination of its transmission.


The most likely cause is that your clutch is slipping. Either because the mechanism isn't working properly (rare but possible) or the clutch is worn (very likely).

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