2000 focus LX engine noise

My focus has been a very good car for 4 years now. Just recently on my way to work I noticed a strange engine noise whenever i pressed the gas down
or accelerated and held it down, but nothing when i took my foot off the gas. A friend took a look and told me that it was a gasket on the right side, possibly the EGA Gasket?? Has anyone had that problem or something similar? or can you tell me how much the part might cost?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.