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I have an 2000 Sierra 5.3 with 49,000 miles. Lately, I think the transmission has started slipping. When I have been going up any hills or grades, it starts to stutter and buck a little. The tachometer goes from about 1.5 to 2.5 and back very rapidly when it should be shifting. Is this a common problem? Does the transmission just need flushed? Any help would be appreciated. Thanks!