Question about 1999 GMC Jimmy
Check for a thermostat that is stuck open and will not let the block warm up when running,if it can't warm up to operational temperatures,it will tell the computer to keep the fuel/air mixture rich and this will will make it run rough, like having the choke on partway in an engine with a carburetor controlled engine
Posted on Feb 07, 2010
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Posted on Jan 02, 2017
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