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Well, If you have changed all of the above the only thing left is the cat. converter. If they are stopped up the engine will shut down to protect itself, it can't breathe. Look under car and see the cat. converter? Is it purple? kick it and see if it rattles.
Audi 1.9 TDI and 2.0 TDI engines with pump-nozzle injection system, (year 2005 included), don't have permission to run with Bio fuel !!!
First you must replace fuel filter, interflow a quality Diesel additive (for 60 liters Diesel fuel dosage) fill up tank with Diesel fuel and run at least 300 km on highway at 3000-3500 rpm in 4-th gear.
I recommend you Foerch Diesel Reiniger System additive! I use this additive from 3 years ago and is certified on Audi TDI engines!
check for 12v constant at your fuel pump if you are not getting that replace your relay.
if you are getting 12 volts at your fuel pump the fuel pump is possible to run tuel it gets warm then shut down to a lower rpm I would then replace the fuel pump
have you replaced your O2 censor yet? or changed your air filter lately. I know our avenger is pretty picky we had a dirty air filter once and it seemed like the O2 censor went out because it kept trying to shut off when the idle was lower. a new air filter did a bit for it then we got a censor reader that you plug into the brain box of the car or the cigarette lighter and it told us the O2 was out and our car was doing the low idle thing. after we fixed it no problems.