Question about 1993 Chevrolet Suburban

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Oily spark plugs

My Chevy truck has 350 cu ,it has been running rough for a couple of weeks now , it starting missing, so i renewed the cap , rotor arm, ht leads and plugs, the truck still misses , i took all the plugs back out and they are black with soot and oil, is it worn piston rings and / or valve seals ?

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  • 52 Answers

Check the knock and o2 sensors

Posted on Apr 13, 2009

  • captainjeffq
    captainjeffq Apr 13, 2009

    check the knock and o2 sensors

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