As far as I know there are two ways to fix your problem:
Clear think time - you can right click on the scenario in the scenario editor and click clear think time; from my understanding this will set all think time to 0, although I have never tested it before.
Change think time in the test - open up your test. At the bottom there should be a tab that says think time; you can choose to use a random think time and set a range, for example you could do: use a random think time from 0 to 1,000 ms.
I don't know of any other ways to fix your problem; but that doesn't mean there aren't any other solutions. If neither of these work for you, you could always try looking through the LoadComplete documentation.