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  1. 1998 slt z71

    98 gmc 5.7 L vortec not running well

    I have a 98 GMC 5.7 L vortec and she's not running very well. When idling it does some minor hitching sometimes it doesn't. Putin around up to about 75-80 km/hr it's not to bad but when she goes into overdrive especially on the highway she hitches pretty bad. Put new plugs and wires in about 4...
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