Hi everyone, I have a 2007 gs 350 awd with about 98k miles. I recently started noticing this strange vibration whenever i stop at a red light. I would describe the vibration as a shiver of some type where the RPM kinda drops. After the vibration, I started noticing my car using a lot of force on the freeway and giving me very low mileage. I did some research and changed the motor mounts, and cleaned the throttle. This slightly fixed the vibration but cleaning the throttle fixed the low mileage/using extra force when driving at high speeds. but the vibration still seems to be a problem. I was wondering if I can get any feedback from anyone experiencing similar problems or someone who might know what the problem is. Also, does the exhaust possibly have any role in the vibrations? Thanks

 

Did you pull any code/s? Fuel injectors?

 

no I didn't do any of that...the car has been really well maintained so I don't know if it's the fuel injectors

 

Is the car on stock suspension or is it lowered?

 

Carbon buildup on the intake valves?