Stu my way of dealing with these things is to deal with the easy/cheap things you can do first.
So fit new plugs and leads, check the air filter (unless filthy not likely to be the cause) and consider changing fuel filter (again not likely to be at fault).
As PU mentions a small air leak can cause these issues so look round any hose that allows air into the mixture.
However a big big clue is the record of constant work on the EGR system.... you may have found the true reason this motor was sold!
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