Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Buy the open and set a 1% limit sell order
Nothing is wrong and it should be profitable - but it sounds too good to be true. The devil is in the details and you have not described how you found those stocks. For example, you may have scanned the 500 stocks in the S&P 500, and you may have found a few that exhibit that pattern over a given time window. But it doesn't mean that they will continue to do so. In other words they may just be random outliers. This is generically called overfitting. A more robust test would be to use a period, say 2000-2005 to find those stocks and check over a future period, say 2006-2014 if the strategy you describe is profitable. My guess is that it won't.