Good point on cleaning up the plenum,

I had mine off during a rebuild (dropped valve seat) and had the head shop tank and blast my plenum and intake manifold. Between the EGR and the PCV, the plenum gets pretty gunked up over the years. Also, the cold start injector can get clogged by the oil and exhaust residue. It is a good idea to pull that out and at least clean off the business end of that injector. I pulled mine and sent it off with the six main injectors to Witch Hunter peformance for a cleaning and flow check.

So many things to clean/maintain when you are in there...

Mike