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Old 10-25-2012, 04:48 PM
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Orient330iNYC Orient330iNYC is online now
Flying monkey herder
Location: Wall St
 
Join Date: Jul 2002
Posts: 7,008
Mein Auto: Daihatsu Terrios
the N54 is prone to carbon building on the intake valves, this leads to generally bad performance.
i suspect that at your mileage, this may be a factor in your misfires and stumbling
unfortunately, a walnut shell blasting of the valves is not cheap- 5-600 dollars, but the only way to clean it if you have the buildup. its visible if you pull the intake manifold.
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