You're both very welcome. Note: Step 3 wasn't typed out completely - The missing sentence is:
"*Scrape bowl and repeat using half of remaining flour mixture and all of remaining chocolate mixture;"
Actually, there's another missing sentence, so I'll just post the entire STEP 3:
STEP 3:
3. In standing mixer fitted with flat beater, beat butter, sugar, and vanilla on medium-high speed until pale and fluffy, about 3 minutes. Reduce speed to medium and add eggs one at a time, mixing about 30 seconds after each addition and scraping down bowl with rubber spatula after first 2 additions. Reduce to medium-low speed (batter may appear separated); add about one-third of flour mixture and half of chocolate/sour cream mixture and mix until just incorporated, about 10 - 20 seconds.
Scrape bowl and repeat using half of remaining flour mixture and all of remaining chocolate mixture; add remaining flour mixture and beat until just incorporated, about 10 seconds. Scrape bowl and mix on medium-low until batter is thoroughly combined, about 30 seconds. Pour batter into prepared Bundt pan, being careful not to pour batter on sides of pan. Bake until wooden skewer inserted into center comes out with few crumbs attached, 45 to 50 minutes. Cool in pan 10 minutes, then invert cake onto parchment-lined wire rack; cool to room temperature, about 3 hours.