Hi All, This isn't on my Audi but my parents Renault Espace 1.9 DCI so I'm hoping someone can offer some advise. Basically they had sluggish acceleration and flat spots so we decided to clean the EGR valve upon recommendation. When we got the EGR valve out it was free and not too built up, but the connection to the manifold its self was severely clogged and had no passage to the intake manifold. We cleaned it all up, but a fair amount of the buildup fell through the inlet manifold which we didn't think much of. The car started and kicked out hellish amounts of black smoke and revved nicely. but after about 15 seconds of trying to clear its lungs it slowed right down and i think some of the deposits got pulled through. The engine now revs very slowly and does not build up boost. the turbo is spooling as upon removal of the pressure sensor you can feel the air being blown out. but it can never build up pressure at high revs. The vacuum line is working and i can manually open and close the waste gate, but i can't check to see if its fully closing. Any advise would be greatly appreciated!