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Gmc jimmy excessive fuel consumption

\015 I do like max 300 Km on a tank. Bad idle , sometimes smell like burn from exhaust and hard to start when its -10 and up outside. when its realy cold outside it starts like a charm on the 1/4 turn.I hear a weard sound in the exhaust ``pfff`` . I am thinking about the catalytic converter or egr valve ??\015 Posted / edited by AnonymousUser on : 18-03-2019

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