My 2007 A3 2.0 is feels like it is only running on 3 cylinders. At an idle the car is shuddering and about to stall.

I took out the #1 cylinder spark plug and the electrode was completely burnt to a nub. I changed all the plugs, all the coil packs and the cylinder still doesn't fire. There is also moisture coming out of the left side tail pipe.

My car has 80,000 and has been serviced regularly. If anybody has any ideas what it might be or knows of a good Audi mechanic in Long Beach, it would be much appreciated

 

was it the timing belt being stretched or was it a failed water pump,or blowed headgasket?