Hmm. While I haven't ruled out the intake manifold leaking, I think the problem may actually be fuel related. If I am correct, cylinders 1 3 and 5 in that order are the last to get fuel. My schrader valve on my fuel rails is very slowly leaking fuel, would that be an indicator of insufficient fuel pressure? I am going to get yet another pressure gauge today to check to see if cylinder 5 is maybe getting scraps for fuel.