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When cold the engine makes a sound like it has an exhaust leak. When the revs go done the sound mostly goes away but the engine smells of gas.

The car has very little power and once warm it will stall. Going along at highway speeds it seems to quit for a second then starts up again. The gas mileage has gotten quite terrible.

A generic code reader shows that the engine is running lean, there is turbo under boost and each spark plug is misfiring.

Any help would be much appreciated.
 

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Check for a gas leak. The lines near the secondary firewall can crack and leak as well as the connections on the fuel rail. Also check the vacuum hoses as a bad hose to the FPR will affect mpg. Post the actual codes to get a better diagnosis. It could be a vacuum leak or even a bad O2 sensor.
 

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There is not one, but my personal favorite is a c7 A6 3.0T with the 8HP transmission, amazing engine, amazing transmission, both will last a long time. Very few failure points in this combo(aside from the occasional oil pump) and with a tune on both components and a few bolt ons, 500 whp is attainable.






192.168.100.1 192.168.1.1 jpg to pdf
 

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It's also possible that you have a plugged cat.
 
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