OK thanks. I will need to get a gasket before I try this.
I see them for sale in USA (without filter) but will try and source in UK for next day delivery so I can get stuck in!!

I cleaned the MAF sensor....I see what you mean about being careful. It was pretty black on those cross wires .
All done and back in, only had it running on driveway anddrove to shops(about 1 mile) but less feathering on idle already!!! We will see if less stalling,feathering on idle at junctions and error codes stop as I drive over next few days.
Many thanks for your help ....... so far

 

Me again!!!
Sourced a gasket ($10 delivered) getting it tomorrow so will try the EGR clean tomorrow

All I do is unbolt the 2 bolts, clean out the insides, put new gasket on and rebolt up.??
Is that correct? do I need to clean the pipe into engine??

Let me know.

 

Please do try to edit your previous post rather than post again...

Anyway, yeah, you'll need a good, sensor safe carbon cleaner to clean the EGR valve. If you want, you can clean the larger port with a metal type pipe cleaner. These engines have a very long EGR supply pipe that has a tendancy to build up carbon deposits. These deposits will then flake off in large chunks and stick the valve open causing driveability concerns. What I have done in the past is to leave the EGR valve off and hit the pipe (its on teh drivers side of the engine between the intake and the valve cover kind of on top of the valve cover. It will have a fabric jacket around it for heat sheilding) to shake anything loose inside and then attempt to start the truck without the EGR valve installed. This will be LOUD and the truck will probably not run correctly (if at all), but the free flow through the pipe should blow anything out. Reassemble and away you go.