2007 Double Cab Vibration

I have a double cab that i recently purchased that has a vibration noise at 900 to 1.200 RPM. I have looked under the hood, where it seems to be coming from but have not been able to find anything loose. happens when increasing or decreasing the RPM's. anyone have similar noises and found what caused it?

 

Found it finally at the air filter. it would rattle so I place some weatherstrip foam around the edges and the vibration finally stopped.

 

Any pictures where where you put it? I have a vibration kind of like a low plastic grone, it's when under slight load in gear but not moving. Looking to anything that may help, might give it a try.

 

Here are some pics of where I put the weatherstriping around the filter and some under the motor cover. got the stripping at Home Depot. Hope it helps!
Learning how to post pictures so I messed up on the first try.