2002 GMC Sierra Repair Question
Bad smell coming from somewhere.
That smell is coming from one of the catalytic converters, typically from a misfire that dumps raw fuel into the exhaust system.
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Caradiodoc is right- can also be caused by leaking injector(s). If this is the case, it may not miss but may be hard to start, and will show a noticeable decrease in mpg.
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