bad gas wouldn't cause one cyl to missfire.

Just pull and replace plugs. not familiar, but does your motor have coil packs or a distributor?

If it does have packs, pull the coil and test it with a multimeter or take it to autozone where they'll bench test it for free.

I had to replace two coils on the bimmer and the feeling is very similar to having a bad/fouled plug.

 

The ignition coil on the GSR caused the car to buck like a wild bull.

 

coil pack does sound likelyh:

 

But the coil on the integ is inside of the distributor. I'm assuming he has one coil pack per cyl.

 

Ah yes, I didn't read "Audi"

 

I think Audi's have issues with the coil packs sitting on the cylinders...

 

Word.

 

all the fart posts were deleted. :lmao:

 

coil pack period

 

yeah thats bs