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Old 10-29-2017, 08:17 AM   #3
68C15
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Join Date: Jan 2004
Location: next to my reloading bench
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Re: 91 s15 jimmy 4.3 rough idle

not really a sensor, but a thermal vacuum switch for the hot air riser valve so it can get warm air around exhaust manifold. Plug it off and move on with life
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