2009 G37. So about two weeks ago my car started shaking whenever i get on the highway and sometimes it stops. Ive taken it to infiniti 3 times since then and all the could find was a low tire pressure on one tire and a i need my rear brakes replaced. The shake comes and goes and never is consistent in how bad it is. Sometimes its so bad i have to pull over. I feel like i got ripped off by the dealer and my car is going to crap itself real soon if i cabt figure out the problem. Sometimes when i park i can smell like a burning smell from my back driver side tire. Is there anyone who has heard of anything like this and could give me some advice. Thanks.

 

double post..

 

check to see if cv joint is exposed and lost grease..
jack up the car and see if the wheels wobble for possible wheel bearing issue..
check to see if you lost wheel weights for balancing..and condition of tires
is the issue speed or road condition sensitive..

 

Also be sure to check brakes for even wear, might have a sticking caliper piston that may have overheated the rotor(s). If you have a Nissan dealer nearby you can try going there for a second opinion.
Sorry to hear of your bad experiences.