a few questions first. how long are your lines? what type of faucet are you using? if they are picnic faucets, make sure you press the lever all the way down. otherwise, it will just foam.
you may have overcarbed it in which case you'll need to take it off gas and keep purging it for a few days. once it isn't releasing any co2 after a few hours, try to set it at serving pressure again. i overcarbed my kolsch about 1.5 weeks ago and i'm still fighting with it. you can also try setting your psi down really low and seeing if you can get a decent pour.