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Discussion Starter · #1 ·
Hey guys, trying to finish up this engine rebuild and I cannot for the life of me figure what this plug is or where it goes. 4.0L, 91' ....



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Discussion Starter · #3 ·
Thanks bud, I figured it was something like that. Was just thrown by how clean the plug was on the inside to have never been plugged in
 

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Discussion Starter · #5 ·
Negative, ac would be over alternator on pass side, this is on drive side right behind throttle body. Which makes me wonder even more.
 
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