Maybe I have a bad batch of coils, I had to try 3 different coils ..each coil would be fine for about an hour and then the burnt taste would start. I have been priming (to best of my knowledge) but that doesn't seem to help anymore. Does anyone know what I am doing wrong. I wasn't having this problem until just recently. I have the nautilus 5ml tank and an Alesia battery. Any ideas would be great! Thanks