Hi guys, please help if you can?
I've started to have issues with my Audi A4 B7 2.0TDI s-line where up to 2000 rpm the car is lumpy and has loads of black smoke out the back until the turbo kicks in at 2000 rpm.
Above 2000 rpm the car goes like mad as the EGR valve was shut off when the car was...
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