I have a A3 3.2 Audi quattro that i have had for 3months now. I have misfire under throttle and can feel the car being pulled back like its not getting enough power almost like a surging affect. I change my plugs but still no change. I plugged it on the computer but no faults that cud suggest anything. My fears are timing chain or a lamda sensor mayb. Any suggestions? I heard of ECU updates but my local dealers are too dumb to find out if mine cud be one of those.