engine vibration
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This might be a long shot, but you might look into it.
I had a vibration, the same as yours in my magnum (Hemi). It turns out that the timing chain tensioner was broken causing a "loose" timing chain. This caused my engine/whole car to vibrate on acceleration. Like yours, it came and went.
I don't know if your V6 has a belt or chain. Either way it may be stretched or loose. It's pretty simple to have the timing cover pulled for a look-see.
Good luck.
I had a vibration, the same as yours in my magnum (Hemi). It turns out that the timing chain tensioner was broken causing a "loose" timing chain. This caused my engine/whole car to vibrate on acceleration. Like yours, it came and went.
I don't know if your V6 has a belt or chain. Either way it may be stretched or loose. It's pretty simple to have the timing cover pulled for a look-see.
Good luck.