RepairPal Certified shops can diagnose and repair your 1998 GMC Jimmy. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Hard to say without more info. Is the check engine light on? If so, post codes. If not, it could be a fouling cat. converter, failed o2 sensor, cylinder misfire or air intake vacuum leaks. Lots of possibilities....