2005 GMC Sierra Pinging noise when accelerate at slow rate

2005 GMC SIERRA
40,000 MILES • 6 CYL • AWD • AUTOMATIC
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CHANNAHP
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Hi,
I have a 2005 GMC Denali truck w/ 40,000 miles on it and I've recently noticed a pinging noise coming from the engine when accelerating slowly. I hear it most at about 35 - 45 mph and uphill especially. What could this be you think?
Aug 19, 2008 at 5:28 PM
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