Weird Smell

[tsheridan44]

Noob here. I have a 95 325i with 135k miles. Whenever I floor it for any length of time there is a weird sulphur smell in the car. Does anyone know what this could be? Appreciate any help I can get.

[tsheridan44]

I found a previous post. Apparently its my cat. Thanks anyway. However, I was wondering if my cat could be causing my erratic idle and an EGO heater fault code (changed my 02 sensor about 6 months ago for periodic maintenance). Any help would be appreciated.