1999 gmc sierra ticking noise?

the b

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i have a 1999 gmc sierra with a 5.3l v8 z71 4x4
and when i push the gas while in drive the truck ticks
sometimes loud sometime just a little
it wont do it when i rev it or when in reverse only drive
can anyone tell me whats wrong its really annoying
and i have no muffler if that would cause any problems
 


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