Biblatex AMA style

Here's a fix. I tested it only on articles and books:

\usepackage[backend=biber, style=authoryear, bibstyle=authortitle, natbib=true, maxcitenames=2, maxbibnames=99, isbn=false, url=false, firstinits=true, uniquename=false, uniquelist=false, terseinits]{biblatex}

\DeclareNameAlias{sortname}{last-first}
\renewcommand*{\revsdnamepunct}{}

\DeclareFieldFormat[article,inbook,incollection,inproceedings,patent,thesis,unpublished]{title}{{#1\isdot}}
\renewbibmacro{in:}{}
\DeclareFieldFormat{pages}{#1}
\renewcommand*{\bibpagespunct}{\addcolon}

% Normal title font (remove italic)
\DeclareFieldFormat{journaltitle}{#1\addperiod}
\DeclareFieldFormat{booktitle}{{#1}}
\DeclareFieldFormat{title}{{#1}}

% Year after title
\renewbibmacro*{journal+issuetitle}{%
    \usebibmacro{journal}%
    \setunit*{\addspace}%
    \iffieldundef{series}
    {}
    {\newunit
        \printfield{series}%
        \setunit{\addspace}}%
    \usebibmacro{issue+date}%
    \setunit{\addsemicolon\addspace}%
    \usebibmacro{volume+number+eid}%
    \setunit{\addcolon\space}%
    \usebibmacro{issue}%
    \newunit%
}

% Print only the year
\renewbibmacro*{issue+date}{%
    \printfield{year}%
}

% Remove "and" from list of authors
\renewcommand*{\finalnamedelim}{\multinamedelim}