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Can anyone identify the problem: when I step on the gas going down the highway, a sulfer/rotten egg smell comes throught the inside air vents (when the fan is on/with or without the air conditioning running)? It rapidly dissipates and does not smell at low or high speeds . . . only when I've stepped on the gas, as I would when passing someone. It's a 2003 V8 4Runner

 

Sounds like your catalytic converter is bad. The smell could be drawn in from under the hood through the cowl.

 

I've got the same problem...same setup (V8, 4wd, 2003, 81,000miles) I mostly notice the smell when there is a window open, particularry the rear window, so I leave it shut. It is the Cat. Converter...Toyota has a problem with that as my neighbor complains about his camary doing it as well as his daughter's corolla. 1 good thing I see: if someone's tailgating me I just step on it...they wonder who ripped one!