Working on my wife's 2004 4.2 liter. Has an air leak coming from the air intake manifold, I believe. I took off the upper part of the manifold and pulled out the blue gasket that seperates the upper from the lower. I see a few small tears in the gasket so i think this might be my problem. Does anyone know what the part number is for this thing? I cant find it anywhere! Thanks in advance for the help!