I have the same problem. Replaced cat and have had it checked by 2 different mechanics and everything is right on the money. It started a year ago right after its 60K tuneup. The last mechanic asked if I drove hard, which I was like sometimes, and he said that the computer system tells it to go full rich at 3/4 throttle. Regardless, I don't think any car should have this smell no matter how you are driving. I smell it pretty much all the time regardless of how I drive it. Its a '95 with only 66K miles on it.
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