Thanks for the replies. There is 10-12 inches from the ignition to the rest of the wires. The throttle arm is plastic as well as the push rod. I have three total switched, two for the receiver and one for iginition. Seems to only do it while engine is running. I couldn't duplicate with ignition powered up but not running. Each elevator does it random, not at the same time so I'm pretty sure it's not the servos. It could be vibration?

Everything has been the same for two years before the problem started. I was thinking ignition or something causing more vibration, so I took it all apart today and didn't find obvious. Although I did notice that one spark plug was nice and tan, and the other very dark. Maybe an ignition problem on one cylinder? I'm going to send my ignition to CH and have it checked out. I might send the engine to BME to have it gone through as well since everything is apart and it's been a couple seasons...