I plan to remove all bad articles of wordpress blog - above 1000 articles out of 1400 articles. I plan to add noindex, follow meta tag on all bad content and remove from Google. It create any problem. I am not want to delete articles, because - i will edit all articles future. Future, i post only quality and unique articles. This will recover my blog from panda update.
Why did you post 1,000 junk articles on your blog to start with? Have you ever read through the google webmaster guidelines? Maybe you should take some time to do that.
Are those rss feeds, or you got them from auto blogging? Cause if they are rss feeds then it is no problem, on auto blogs there is a problem, but it can be fixed with a plugin called kb_robots.txt.
I added noindex 2 months ago on 10 of my sites. The content that I noindexed wasn't junk, just less than 300 words of content pages. I have seen no change. Some of the experts believe that the devaluing in the SERPs is due to an overall quality score of your site. That means a noindex would not change that rating, even though some Google engineers in a SearchEngineWorld article said it would. I'm now either beefing up those pages or deleting them.
Adding ‘noindex’ to your blog post will prohibit SEs from further indexing…. It won’t remove your indexed posts from Google’s index. You have to remove them from search results using Google removal tool. Neither you want to delete your content nor you want them to get indexed…. So, noindex is the best thing to do! Start concentrating on higher quality content and start building links