I know the feeling, that is scary... Yep, you have classic case of worn out ball joints, and or un-even wear on your tires. In my case, ball joint on axle side of drag link had a TINY amount of vertical play, and ball joint on drivers side track bar was same. So, two different systems reacting against each other caused the wobble.
Knowing that this was my issue, while I waited for my parts to arrive to correct it, I tested out a theory while driving. Fortunately for me I have a road that this would happen on that was a low speed back country road. The next time it happened, instead of driving straight hoping the wobble would go away, I instead steered hard left and right to try to force the wheels out of their opposing wobble. I sort of worked, the wobble went away but it was still a while for it to happen. Unfortunately, un-accelerated flight (I straight and no change in power) never seems to eliminate this when it happens.
Since replacing my ball joints I'm good, except I just got a little wobble back after I rotated my tires. It's starting to go away now that the tires are starting to wear back to what they should be. I keep checking all my ball joints over and over thinking maybe I have another one going bad, but they all feel pretty solid so far. I think I just learned a very valuable lesson on tire rotation. Rotate rear tires forward, take forward tires and cross to back. This way, your front tires are always tires that have already been on that side of the car, so the wear pattern is already more like what they will end up being versus being drastically different. Now, I didn't rotate like this because I was seeing some very goofy wear patterns on my tire and in this case, I distinctly wanted a particular tire on my left rear to try and fix some goofy feathering and miss-treading that I was seeing.
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