The way you said that kinda gave me an idea that things weren't all right with you.
How you said that kinda gave me an idea that things weren't all right with you.
Are how/this way interchangeable? Are them sentences I used grammatically correct?
Are how/this way interchangeable?
Based on experience, yes, they are. "The way" and "how" are synonymous in such a way that both deliver the same message to the reader. Use either to your preference.