Hey guys i hope all is well, I have a 2007 Ls460L with 132,000 miles and i've been experiencing a heavy vibration/ shutter around 40 mph and it gets worse and worse in stop and go traffic but goes away for the most part at highway speeds (No check engine light). I recently took it to my mechanic and he changed my spark plugs hoping it would solve the problem and it was unsuccessful. I also had the tcu software updated through the lexus dealership and it did'nt resolve the issue either. Ive taken the car to 3 different autoshops and they cant seem to diagnose the issue with out wasting my money hoping it resolves the issue. I also recently just found out i have a coolant leak (i'm not sure if it has to do with the vibration issue) I hope someone can help
