Is drinking 2 cups of coffee making my heart flutter? I've been drinking it for years with no problem. It flutters ALL day now not just right after

Maybe. It sounds like you're having palpitations. That could mean you have an abnormal heart rhythm. You should see your doctor to have an EKG done. 2 cups of regular coffee wouldn't be expected to increase palpitations if that's your normal amount. Avoid other stimulants (energy drinks, nasal decongestants, drugs of abuse).