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Your 1998 GMC Sierra is surging especially when the AC is on but surges when ac is off you had the timing checked and adjusted but it is still happening fuel pump may be whining coolant fluid brown?
Wiki User
∙ 17y ago
i would start with fixing coolant problem brown coolant indicates there is oil in your coolant which indicyrs either a blown head gasket or a cracked head you fix that problem and more than likely, the surging problem will go away
Wiki User
∙ 17y ago
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