Question about 2002 Saab 9-5

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Saab 9.5 2.2 tid 2004. The problem started with black smoke when driving more so under acceleration. Had car checked and exhaust cleaned out and was told it was showing a fault with the mass airflow meter but when it's unplugged it stops smoking but won't rev over 3000rpm and is very slow to pick up speed. So i changed the meter but it still smoked and was lumpy at changing gear (automatic) I then cleaned the egr valve and throttle housing which were very dirty i think due to driving with the air meter unplugged. then tried it again but still has this lumpy gear change.engine light is still on and showing one fault. Hope you can help me with this annoying bloody car. Regards. Murbo.

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