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I recently bought a 2001 A6 2.8 Quattro AWD Automatic. It has 100k miles on it and started out running fine until one day after I filled up the tank.

Starting after about 15mi of driving after filling the tank the car started to lose power. While at speed the car felt as if there was no gas getting to the engine, then it would kick in, it repeated this issue for around 5-10min of driving. From what I could tell if I was coasting the issue did not occur, but only occurred while maintaining speed or accelerating. Also, if I had to stop for a stop light during this 5-10min span the car would shut off. It would then start up again just fine, but continue with the problem.

The first time this happened, I added some fuel injector cleaner and continued on my merry way. No problems occurred for around a month. The EXACT same situation occurred just today, filled up, drove 15mi (along the same route, the car even shut off at the same intersection), continued to occur for 5-10min, then the car started running fine again. I am most likely going to take it into the shop this weekend (time permitting), but I wanted to get some opinions first.

Thoughts?  

If you have not had a carburator overhaul by now this could be your
problem. When all the fuel in the float bowl burns up, the engine dies.  
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John R. seeking for the best maintenance help on Toyota Corolla cars..

check out the carburator

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