I put my engine back together after replacing the trans, and head gasket. Now I got the timing on pretty much. There is a BIG air leak coming from the driver side plenum. I think it's coming from underneath, but it doesnt' sound as bad from the passenger side. it seems to make the idle erratic and if you listen to it when the idle goes up it seems to get louder. I don't know if this has anything to do with it but I have the idle adjustment screw all the way out and it is still a little high. It runs but when you drive it and give it any gas it feels like it loads up or something, it just has no power at all. You can't step on the gas. Can anybody please help. What happens if an EGR goes bad?