I need to clean out my intake manifold because the deposits inside are throwing a CEL saying my EGR valve is bad. I've had it checked out, and I was told that the valve would most likly hold up if all of the passages inside the intake were cleaned out well. I've got the Helm's manual and such, and so this evening I thought I'd start tearing into it. When I looked at the diagram though, the bottom half of the manifold (which bolts to the block) seems NEARLY impossible to get off without removing the engine in order to get to the bolts on the bottom of the manifold. Would it be safe to take the top of the manifold off and clean it out, and then to shoot a little carb cleaner down into the manifold passages and scrub them out with a bendable brush? I'm not to keen on this idea cause I don't really want all that crap to fall into the engine, but I don't know of how else to do it.... Help? Advice? thanks.