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I want to display in a featured slideshow only 3 posts, but it is ignored and it shows a lot of posts. How to fix it?

$my_query = new WP_Query(
        'posts_per_page' => 3, 
        'post_id' => $featitem 
while ($my_query->have_posts()) : 
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post_id is not a WP_Query parameter. Perhaps you meant post__in? If so then $featitem needs to be an array of post IDs.

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