Tccm datalink malfunction class2

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elt

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I got this code today.
But i dont see how it could be causing the engine problems i am having. At low speed. <30 mph the motor almost stalls. Rpm will drop from 2k to 1k and back. Once i hit 30 it goes away. Any thoughts?

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elt

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1999 gmc yukon slt

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elt

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So looking at the part there are 2 models. Is it based on what transfer case i have?

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elt

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Has anyone changed out there tccm? Having issues removing the old one

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