Everything was going along fine, then suddenly lots of vapor but not much flavor. Then the vapor began to taste burnt? I changed coils, primed it a little, then tried it. It was worse. I cleaned out the old coil, primed then lots of vapor and no flavor again. Then began to taste burned again. Almost an electric burnt taste, not the usual sickening sweet burnt taste. I'm out of ideas at the moment. Is there anything you can soak a coil in to really clean it out? Is there something else going on here?