Inside plenum, Should I clean?
 

This is what my throttle body and plenum look like. Should they look like this or should i clean them. What is the best way to clean them? Is it hard to take the plenum off? https://www.f150online.com/forums/me...ide-plenum.jpg

I ld say that it needs a good cleaning. Check out these links

https://www.f150online.com/forums/ar...ttle-body.html

http://www.fordf150.net/howto/throttlebodyclean.php