Filter the query: filter content of posts accoring to post title and meta value

filter_query_loop.php

<?php
// To plugin or functions.php

add_filter( 'posts_where', 'your_title_func', 10, 2 );
function your_title_func( $where, &$the_query )
{
    global $wpdb;
    if ( $search_title = $the_query->get( 'search_title' ) ) {
        $where .= ' AND ' . $wpdb->posts . '.post_title LIKE \'' . esc_sql( like_escape( $search_title ) ) . '%\'';
    }
    return $where;
}

// To the loop

$postcode = $_POST['postcode'];
$title = $_POST['term'];

$args = array(
  'post_type' => 'product',
  'search_title'   => $title,
  'meta_query' => array( 
    array( 'key' => 'custom_field_ID_1',
          'value' => $postcode,'compare' => 'LIKE' )
        )
    );