My 2000SLE smells like burnt plastic and now vibrates after 50mph. I haven't done any mod'* or messed with wiring harnesses and there'* no SES codes.

If I throw the car in neutral after 50mph, the car still vibrates even out of gear.

Has anyone had this problem or can help troubleshoot the cause?

thanks

Also check your inner fenders to ensure they are in the proper place.

Thanks, I'll check it out.
-TJ

i think that your two problems are unrelated. i dont know what the plastic smell could be, however the vibration issue is most likely a bad wheel hub

Could it be wheel balancing is off. What condition are the tires in, how many miles, wear..... etc?

Well, the SES light went on last night , so it'* probably related to that. I'm going to Autozone and get it scanned. Hopefully it'* a sensor easy to get to.

any luck with the scans?

presumably, if the shake is still there in neutral at 50, and not there at a stop, then its not engine related. it most likely a bad wheel hub or a bad wheel balance

Sounds like it could be alignment, wheels/tires, bad belts, damaged rim, constant velocity shaft.
Since you don't say the steering wheel vibrates I would suspect rear. Bad belt on front would give a feel in steering wheel on smooth street at lower speeds.

How many miles on tires? HAve they been rotated frequently to avoid uneven wear, especially on rear position?