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I would take your car back to the place that replaced your steering rack,It could be defective. There are also hoses that go between the rack and the pump that could be leaking or the pump itself.
Usually with the Audi's it is a combination of valve cover gaskets, cam chain tensioner gaskets and rear cam plugs, It can easily be about a 400-500 dollar job.
Probably needs a seat belt receptacle, or at least looked at for maybe a loose or broken connection under the seat.
I looked up the parts for youre car and there are three catalytic converters a front, center and rear,all three total up to about $2400.00 plus labor,
Greg I looked up the flat rate time which is 7.6 hours to remove torque converter, then an additional amount for the front seal if it is that, another problem, that can be encountered is when removing and reinstalling the converter, if not precise in doing so, you can easily damage a key oring that prevents the torque converter from locking up. I hope this helps.
Ben It is hard to say what the problem is without more info, like when was the last time you changed the fuel filter or the spark plugs,what is the current mileage etc.,sounds like it could be a fuel issue if it is happening cold and ok after that, but would require a little more diagnostics to prove and info.
If it wont pop up either something is jamming it, or it needs to be replaced with a new unit available from mercedes benz
Make sure the ring on the axle is secure, not missing any teeth and clean, if that is not it, it is more than likely an early onset of ABS module problem, though hard to tell, not seeing and looking thru a computer to see what is happening
Bring it by my shop in Scarborough and I will give you a free engine diagnostic, Without knowing what codes are there it is hard to diagnose although I know of many common problems, such as plugging of the intake with soot and such!
Replacing a MAF is a pretty straight forward thing plug and play, the only recommendation I really have is to clear the adaptions currently set by maybe a bad MAF or a misdiagnosed problem? Did you buy a OEM MAF or aftermarket?