get_field not returning anything inside wp_query loop

Been struggling with this for a while now and would really like some help!

Here’s my code:

<?php
$temp = $wp_query;
$wp_query= null;
$wp_query = new WP_Query();
$wp_query->query('cat=3&showposts=10'.'&paged='.$paged);
?>

<article class="innerwrap" id="content">

	<?php if ( have_posts() ) : while ( have_posts() ) : the_post(); ?>

	<div class="testimonial">

		<?php $job_title = get_field('job_title'); ?>
		<?php $photo = get_field('photo'); ?>

		<?php echo($photo); ?>

		<div class="testimonial"><?php the_content(); ?></div>

		<div class="tname"><?php the_title(); ?> - <?php echo($job_title); ?></div>

	</div>

<?php endwhile; else: ?>
<p><?php _e('Sorry, no posts matched your criteria.'); ?></p>

<?php endif; ?>

Basically it’s a testimonial page. I want it to loop through all the posts and get the job title and photo for each testimonial.

ATM it’s not returning anything.

I also tried:

get_field(‘job_title’, $post_id );
and
get_field(‘job_title’, $post->ID);

TIA!