Tach jumpy when cold....

[magimerlin]

94 k1500 5.7 4L60E 4x4.. like title says my tach needle is jumpy till the motor runs for 30 seconds to a minute (depends on outside temp)... anyone have this issue before and or have an idea what it may be?? Thank y'all

and

happy Turkey day to y'all

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sent from what use to be a great country...