HouseCallAuto 3/31/2010The intake manifold gaskets on the 4.3 are so common to fail. I mean just Google it. It is all over the net. If it is not the intake gasket then any other leak would be easy to see. The corner of the intake on the drivers side is obscured by the air conditioner bracket so it is hard to see the exact place they leak from, but, you can see it if you stand to the left and lean in. They can also (and do) leak fromthe other corners as well.