Indenting part of paragraph after \\ in a list

Question

MWE:

\documentclass{article}
\begin{document}
A list:

\begin{itemize}
\item \texttt{abc def ghi}\\
This needs to be indented.
\item \texttt{jkl mno pqr}\\
This needs to me indented, too.
\item \texttt{stu vwx yz}\\
But this musn't be indented.
\end{itemize}
\end{document}

I need to indent a little a text after \\ in \item. I need it not to be global change because some of texts (maybe in another list) must not be indented.

EDIT:

\documentclass{article}
\usepackage{enumitem}
\setlist{parsep=0pt,listparindent=\parindent}

\begin{document}
A list:
\begin{itemize}
\item \texttt{abc def ghi}

This needs to be indented.
\item \texttt{jkl mno pqr}

This needs to me indented, too. It is a very long text and I need it to be moved right, not only the first line.
\item \texttt{stu vwx yz}\\
But this musn't be indented.
\end{itemize}
\end{document}

I said earlier something different that I meant. I don't want an indent (that moves first line right). I want to move all lines right.

Answer 1

Load the enumitem package to change (follow-up) paragraph spacing and indentation inside lists, and in the text body use paragraphs (blank lines) instead of \\ at the appropriate places.

\documentclass{article}

\usepackage{enumitem}
\setlist{parsep=0pt,listparindent=\parindent}

\begin{document}

A list:

\begin{itemize}
\item \texttt{abc def ghi}

This needs to be indented.
\item \texttt{jkl mno pqr}

This needs to me indented, too.
\item \texttt{stu vwx yz}\\
But this musn't be indented.
\end{itemize}

\end{document}

EDIT: Your revised requirement can be solved by, e.g., using the addmargin environment of the scrextend package (part of KOMA-Script):

\documentclass{article}

\usepackage{enumitem}
\setlist{parsep=0pt,listparindent=\parindent}

\usepackage{scrextend}

\begin{document}

A list:

\begin{itemize}
\item \texttt{abc def ghi}

This needs to be indented.
\item \texttt{jkl mno pqr}

\begin{addmargin}[\parindent]{0pt}% optional: additional left margin, mandatory: additional margin
This needs to me indented, too. It is a very long text and I need it to be moved right, not only the first line.
\end{addmargin}
\item \texttt{stu vwx yz}\\
But this musn't be indented.
\end{itemize}

\end{document}