If it has sat for a while (dry or in juice) you may need to clean (rinse) or replace your coil. I'd also say clean the entire tank. I try my best to put away my tanks clean and dry, I don't always do it, but usually if I try to vape it... It's not good, in many ways, but also in terms of not wanting to wick well. I find this less of a problem if I leave the tank dry, but my coil may still need some "actions" (up to and including replacing it sometimes). Best of luck,
Anna