I had a very similar rpm fluctuation occurring to what I saw in the video about 2 months ago. When at 1000 rpm on the ground I would see the rpm drop down to below 900 every few seconds. I brought the plane to the shop and it turned out mag timing was off. $180 and 2 hours later all was fixed and I ...

Just my 2 cents about the g1000 issues. I had the same problems actually on the first flight after purchasing the aircraft. I had the magnetometer replaced with a refurbished model from Garmin and I haven't seen the issue since in flight. I have however still encountered it on the ground a couple ti...

I had the same issue that you're reporting. After trying to troubleshoot the issue for a couple days my mechanic decided the best course of action was to just replace it with a refurbished model. I can't say for sure that it couldn't have been fixed but I trusted my mechanic's opinion here and I hav...