Came off motorway tonight pulled up to traffic island,tickover went very rough and was a bit crap pulling away from standing (ok when booting it though) this carried on all the way home in rush hour traffic, when i got home looked in engine compartment and the pipe from the egr valve to the air inlet manifold was very hot (i believe that my egr valve has been turned off as every time i put car on op com it states inactive and there appears to be some kind of shim under the valve,not had it off to check if blanking plate as my tool kit is at work) the question is should this pipe be hot after a 20 mile journey??
many thanks in advance...

engine is a Z22SE