Well you've got the most important thing done!
After that I'd go through the sensors and check/ clean them all ( check the diesel power loss guide in the stickies if you need), but the MAF sensor needs checking ( if it's the original it's probably past it if you are on 85k, they seem to start to go around that age), the MAP sensor and boost solenoid all will help make it more responsive, and are easy jobs.
You can also try and get rid of more gunk in the manifold. If you are due a cam belt change soon, then that's the best time to open it up and do a thorough job.
Otherwise a lighter job can be done. I used EGR cleaner ( as I know it's designed to go through a running engine, though don't know how it could clean an EGR!) .
You can spray it after the MAF sensor, though I sprayed it more direct through the EGR port.
Personally I sprayed a bit in and left it for a minute then started then engine and sprayed more in kind of as the instructions. Seemed to improve things, a fair bit of smoke too as crap went through.
There is also a good 'throttle body' clean out guide in the stickies, that will also give you direct access down the manifold ( some have stuffed rags down it to clean it more (be sure not to loose it though!)).
http://www.alfaowner.com/Forum/showthread.php?t=348040 (How To: 2.4 JTDm throttle body & EGR clean-out)
After the EGR is blanked, with the oil from the crank case being vented back through the manifold, an element of self cleaning does occur (no soot now to make the gunky stuff) .
You can also run a fuel system cleaner for the injector side of things, diesel rhino is respected by many of us.
After that, you probably need to consult a specialist, talk about swirl valves etc.
Oh, and check if they only software deleted the EGR or blanked it physically too. If only software, get a blanking plate on it (cheap and easy job) many older EGRs are known to leak even if they are turned off due to build up of crap in them.
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