Mum's DTI's been running with the EML on for a couple of days now. Today I cleaned the EGR and throttle body to no avail. Then I fiddled with the flaps in the intake manifold. Moved the controller arm in and out a bit. When I started it up there was a huuuuge white-blue-ish smokescreen coming out of the back and the engine was spluttering and shaking a lot if I held the revs at about 2000.

What have I done?