Hi, a few days ago I went for a ride on my 08 z1000 and when I came to a junction I noticed the bike felt like it was running on 3 cylinders, it seems to run great once I open it up. when I got back I did a little research which led me believe it could be the plugs or maybe a coil, I checked the coils primary and secondary restistance and they all checked out good. The plugs also look fine. The bike has done 8k but has never had a plug change only oil and filters. The air filter also looks good. Does anybody have any other ideas. Also I changed the exhaust a few months back but it's been okay up until now. Thanks.