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Re: Had to buy - '77 Suburban
It didn't seem to be running on all 8 when I got it so I pulled the plugs. Found this thing on one of the plugs. A friend of mine said they sell them for fuel economy and/or to stop a bad cylinder from burning oil. I put new plugs in and after tuning it it runs very smooth with good power. I like keeping old drivetrains alive so I'm hoping this one turns out ok after driving it a while. If not, this will turn into an LS swap thread.
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