Ford Taurus DOHC engine noise

I have a 2000 Taurus with a 35,000 mile DOHC engine with a s code. Has a engine knock at idle & while accelerating. Engine runs great & noise does not
go away while "shorting" out the cyls. any ideas?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload 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.