If I just set limit sell orders on my stocks, won’t I be able to make guaranteed easy profits all the time?

sorry if this sounds dumb. pretty new to investing. But just wondering if this idea has some flaw to it (obviously there has to be right?)

I've set order buy limits before for my stocks owned and it has always worked out pretty well as my stock would got auto-sold during the trading day at just the high price I want before the price ends up much lower at closing day.

And it seems stock prices tend to inevitably flunctuate upwards somewhat during the day at the very least…no matter how marginal.

So I was just thinking, why not I just set limit orders all the time to make profits?
For example, I notice Google stocks tend to flunctuate between $1-2 esch day.

So if I use $100k to buy 715 google stocks at $140 each right now, then immediately set an order to sell off all stocks at $141… that's an easy $715 profit for me, right? The profit should be guaranteed given it is extremely likely for the stock to increase by a mere $1 during the trading day.

Then I can keep doing this repetitively accumlate small profits.