Hey , my a3 has developed a misfire on cylinder 3 . It happened when i turned the engine off then turned it back on it was running on 3 cylinders . Its the 1.8t agu engine made in 1999 . Iv swapped coils around and spark plugs . Also checked for broken wires but it still only runs on 3 cylinders have read and wonder if it could be the ignition amplifier? Plugged it onto diagnostics bought up a knock sensor and oxygen sensor - cleared them took it down the road they haven't reappeared ! Iv got to this box ( will add photo now ) is this the amplifier and is there a way to test it? Any help or advice would be appreciated Cheers!