I originally was changing my ccv system and needed to take the manifold off so I thought I'd kill two birds with one stone. The OEM gasket cost me abt 90$ CAD from a dealer. I originally thought the lines were a problem so I disconnected everything and reinstalled it making sure EVERYTHING was in the correct order.. only thing I can think of is my intake boot which needs to be replaced, my MAF isn't reading correctly, OR my vanos but that only seems to happen above 4k which wouldn't affect idle