My dad recently purchased a 2003 audi A4 1.8T quattro. we were out driving the other day. running just fine. went into the store and it started up wierd when we came out. it sputtered a bit and died. started it again and check engine came on and gave us a misfire reading in 3 cylinders.
any ideas to what would cause 3 misfiring cylinders out of nowhere?

 

coilpacks

 

Ditto. When were the plugs replaced last? NGK