The tailgate - on those trucks (I have a 2000 Sierra) you need to disassemble and relube the tailgate latch mechanisms every couple of years to prevent this.
Same goes for the throttle body. 99-2001 vortec motors tend to have excessive carbon buildup and must be cleaned as stated above.
I use Throttle Body cleaner, a clean rag and some qtips
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Joe - Formerly 67c10step
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