Hi guys girls, recently purchased a 1.8t agu a3, 1999, my apu a4 1999 was recently wrote off and went like a rocket in comparison having an extra 100 tho on the clock, have done all the usual vacume tests, boost tests, full service ect, but just feels so slow, diagnostic check comes back clear, any ideas common problems?, the only thing I have done is put an 8d0 ignition amplifier on as older 4d0 unit was playing up, I know these are different part no's but seems to run fine with it, any help would be greatly appreciated, thanks in advance..