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2002 Audi A6 Quattro Questions

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No matter how fast or
At highway speeds there is no apparent loss of cooling, but at stops or slow speeds there is a definite reduction or loss of cold air.
What seems to make the problem better or worse? Highway speeds appears to elliminate the problem.
How long have you had this problem? About six months

How long have you had this problem? The car is new to me. I didn't notice the noise on the test drive.
And how do you change it
I want to change the transmission
Happens every time you try to put in drive won't shift in drive but will shift every other gear
It is a simpler question. How many cats are there on the 2002 Audi A6, 3L
I have a 2002 quattro 3.0 and I have been trying to track down the source of my reoccurring P0300,301,302,303 misfires... I have tried all the usual suspects... Replaced plugs and coil packs, O2 sensor (even though there was no o2 fault code and now there IS P0140), patched an exhaust leak, replaced breather hoses (found them cracked and broken when I did the o2 sensor), found that the vacuum line was not connected to the fuel pressure regulator so I reconnected it (NO change) I can't pass emissions with my check engine light coming on every time the car warms up (the only reason it goes off is because I clear the code)... Where should I go from here? (with very limited resources)
Runs great except when idling it cuts out and shakes. Any ideas? Also have headlight issue. Headlights will not go down to low beams and high beams work good. Checked several things. Changed out headlights from used car and not sure if that's the reason or if need to try something else or any ideas what to check?
costing/light braking to a stop and the anti-lock brake fires several times. then all is well. this happens in the summer. how can i fix the issue. The ESP light comes on and dealer will not invest the time to find the issue, just sell a new car
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