Unfortunately I don't have my factory manual here at school with me, so I can't help you on the mechanics of taking that baby off.
Do you leak boost at all?
IM gasket good?
Manifold bolted tightly against the head and not loose?
I had some crappy Hondata washers on my IM studs/bolts one time... totally skewed the torque numbers to tighten them down and I leaked vacuum horribly.