Question about 1999 GMC Suburban

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Truck is running sluggish

When I first take off the truck runs sluggish. It's leaking oil and I don't understand why. 2 weeks ago I changed the head on it tightend the valves and changed the spark plugs. Now the truck is leaking oil, runs like it has no pick up unless I push it. What is the problem?

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Your valves may be too tight. Try to retighten them using the loosen until it clacks and then tighten one full turn. Leaking oil can be blowby.

Posted on Dec 30, 2008

  • David Robinson Dec 31, 2008

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