Started up and ran great cold. Rode it 10 minutes to a friends house to ride together. Go to leave and it just runs like its dropping a cylinder. I've got a feeling its ignition related because its puffing smoke on hard acceleration. But its weird. Runs ok then just drops power and won't idle unless I hold the throttle. Any common things to check before I pull it apart and ohm out the coils and grounds?

Thanks!