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it's getting to much fuel,running rich. the catoletic converter is what is causing the smell trying to clean up the emissions from the exhaust gases.could be a bad fuel pressure regulator or map sensor making it run rich you have dual coils on that car. One of them probably has a bad plug or two causing a misfire, causing the car to run rough. The smell is the catalytic converter trying to clean up the unburned fuel passing through the misfiring cylinder and into the exhaust. Typical mustang problem that Ford knows about but continues to make the same mistake on all mustang gt's up to 2004.

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โˆ™ 2005-09-29 20:42:19
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Q: Why would a 1996 Mustang GT suddenly start to smell like fart and eggs and idle rough?
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