First check the obvious stuff:
If that does not turn up anything I would:
Good Luck, I hope this helps
Sound's as if either the wheels are out of balance, or the brake rotors are out of round,,, i would say the rotors may need replaced, but have the wheels checked if that's not the prob then replace the roto
rs
SOURCE: front end shimmy over 60 miles per hour
If you are experiencing a "shimmy" that only occurs at a certain speed, I'd suspect a tire balance issue. If it were in the alignment, the problem would manifest itself at all speeds not just at 60 mph. There's a chance that a wheel weight fell off or the tires have uneven wear. If you do have uneven wear on the tires, then you may worn front end parts that need to be dealt with. Incorrect tire pressure can cause uneven wear as well. Hope this helps.
SOURCE: LS 400 ENGINE CONCERN
check engine codes. also may be a bad coil. you have 2. one on each side. it will run with 1 but vibrates very bad.
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