Sometimes the time of day makes a difference on EMI. Another thing you can do is wiggle the coil wire at the control box and at the coil itself and see if it causes chatter. This could tell you about a problem spot. Also, I cured a chattering problem with my T2 and also a charging problem with my apple computer by cleaning the cable contacts with a q-tip and deoxit d5. Another electrical contact cleaner might work. As for learning my Mojave, what helped most was putting good and bad stuff on a clean piece of ground and listening to them as i swept the coil over them. I would change positions, close and far, on top of each other, etc. and practiced often. Now to me an aluminum tab says "KaK" while a coin says "gag". Happy hunting and I hope you find a fortune. BTW, what part of Colorado do you live in?