Displaying custom posts with "read more" in a shortcode

I created a custom post type, “Testimonials” so that my client can easily add new testimonials as she receives them from her clients. By using the “post snippets” plugin, I have created a shortcode to display each testimonial by specifying the post ID like this: [testimonial id=”100″] By simply filling in the client’s name in the title, position in the custom fields, and testimonial in the content area, the shortcode then creates a properly styled testimonial box for her. However I am having trouble getting the content to appear the way I would like. I am by no means a PHP expert, but I am having trouble figuring out what I’ve missed here.

The following code does work:

echo "<div class=\"boxbox\">";
echo "<div class=\"box\">";
$title = get_the_title('{id}');
echo "<span style=\"color:#060c59\"><strong>$title</strong></span>";
echo "<br/>";
$position = get_post_meta('{id}', 'position', true);
echo "<span style=\"text-decoration: underline\"><em>$position</em></span>";
echo "<br/><br/>";

// This section is a compromise but it works:
$post_id = {id};
$queried_post = get_post($post_id);
$content = $queried_post->post_content;
$content = apply_filters('the_content', $content);
$content = str_replace(']]>', ']]>', $content);
echo $content;
// End of the section

echo "</div>";
echo "</div>";

The above displays the testimonial, but if I understand correctly, by using the_content() I should be able to display a “Read More” link on especially long ones. I would like to replace my “compromise” section with something the following:

query_posts( 'p={id}' );
global $more;
$more = 0;
while (have_posts()) : the_post();
the_content( 'Read more »' );
endwhile;
wp_reset_query();

But it doesn’t work. Instead, the content doesn’t display at all. I also tried the same method with WP_Query. Is my PHP wrong, or is it something about the plugin? Is there any way I can get this to work? Any help would be greatly appreciated. Thanks.

http://ww.wp.xz.cn/extend/plugins/post-snippets/