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Old 10-05-2014, 06:55 PM   #1
1990Sierra
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Join Date: Aug 2014
Location: Arlington, Washington
Posts: 7
Erratic idle
I have a 1990 GMC Sierra 1500 5.7 2wd. When i have the timing advance unplugged my run as great. But when i plug it back in my truck barely runs. Had trouble keeping idle.. Anyone know what could be causing this?
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