First, let it sit for a few more weeks before you drink it; your beer is still to green and is not going to taste like it should and it will be cloudy. However, if after a few more weeks you are getting the same sour taste, then you are adding contamination at some stage in your process. I know you used a different yeast this time, but you didn't say if you did anything different when you brewed. Here's a checklist for you:
-Did you thoroughly clean AND sanitize your fermenter, airlock, and anything else that touches your wort.
-Is your fermenting bucket discolored on the inside or does it have an odor? If so, get a new bucket.
-Did you add ice or tap water to your wort (which can cause contamination)? In my earliest post on this thread I emphasized that yeast probably was not the problem- it is your water. So, did you use tap water in the boil kettle and bottled water to top off your fermenter and ice for an icebath to cool your wort? If not, you should have.
If you did all of the above, then I would say your tap water is a total mess and you should use nothing but bottled water and maybe get a new fermenting bucket.
-Did you thoroughly clean AND sanitize your fermenter, airlock, and anything else that touches your wort.
-Is your fermenting bucket discolored on the inside or does it have an odor? If so, get a new bucket.
-Did you add ice or tap water to your wort (which can cause contamination)? In my earliest post on this thread I emphasized that yeast probably was not the problem- it is your water. So, did you use tap water in the boil kettle and bottled water to top off your fermenter and ice for an icebath to cool your wort? If not, you should have.
If you did all of the above, then I would say your tap water is a total mess and you should use nothing but bottled water and maybe get a new fermenting bucket.