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I have a Volvo 08 S80 v8 I changed the valve cover gasket and intake gasket about four days after driving the car, check engine light came on ,scanned it got codes p0171 and p0174. my short term fuel trim is around 0 to 9 and my long term is at 29 at idle. When ever I give it gas the long term drops down to 0. What else do i need to check to solve this problem ?
 

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I think you've got an air leak.

Just double check you plugged in all the various hoses (PCV system, variable intake manifold runner controls, intake manifolds all properly tightened, etc...).
 
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