Catalytic converters are on their way out.

 

I had the same thing in my Jeep and the 4-runner. I was told by my dad and both the GM and Toyota dealer that it was the catalytic converter. My 4 runner did it for 3 years when ever I was going up hill or the rpm's got high. Never went out or any other problem, just stinky. My Jeep only does it up hill too.

Honestly I wouldn't worry about it unless you notice some other issue, like running rough or loss of power.
Lisa

 

deffo look at the cats first. they smell like eggs when they are either brand new or on the way out.

 

ok sounds gooood to me, i thought my trans was messing up on me