I have a couple vivi novas that i rebuilt the heads and and the evic read 2 ohms. Now i screw it on the vamo and it will read 2 one time then the next .9, so i unscrew it screw it back and now 1.2. Then i repeat and it might read 2 or it may still read something under 1.3. What is causing the way out of wack readings on the vamo cause me evic reads it within .2 most all the time? At first when i noticed this it didnt bother me but the last time i had to screw it on and off 10 times to get the vamo to register a reading it would fire at.