I drove my 94 ls400 (104,000mi) home the other day with no problems, parked it, and there it sat for 4 days. Yesterday, I jumped in to go to the office and at first I though I had a flat tire. After a block, I pulled over and looked at both the front tires, but everything ok. Got back in and started driving, but the further I went, the problem got worse, and within a mile, I could go no faster than 10mph or the whole front end would shake like it had a flat tire. I nursed it back home, and the left front end had a smell like it had overheated.
Anyone have any ideas what may have happened? Your help is greatly appreciated

 

Maybe the brake caliper is binding against the rotor and caused the brake to overheat and warp the rotor which would give you a vibration and as a result a burning smell

 

Frozen brake caliper. My 92 does the same thing from time to time, normally in the wintermonths tho. Need to replace the caliper.