Have a 96 a4,2.8 non quattro. Just last week started to stall at lights then would take a while to start. Could smell gas strongly so I changed plugs and wires. Worked fine for a day then same thing. I took off fuel rail and tested injectors for dripping and no drips they week fine. I put back together and ran rough. Now it takes longer to start and there is fuel coming from exhaust pipe. Or at least I think its fuel could just be condensation mixed with strong fuel smell. Any ideas? Thanks a lot

 

Also plugs are fouled bad. I took them out and cleaned twice since replacing. Seems like too much fuel or not enough spark. Not sure please let me know any ideas you have