I took out the DISA valve today and I was able to pull it out without any effort, the gasket is flat and the bad news is that the flap is not working. I tested the vacuum and is working fine, it's just that the flap is disconnected. I used the ford thermostat housing o-ring and it was thick, I have to shave off some if and use lithium grease when installing it back. No lean codes pending and my STFT is hanging at 6% on bank 1 and 4% on bank 2. I'll find another DISA valve to replace it tomorrow or buy the fix kit. Hopefully the vibration at idle is caused mainly by the DISA valve and not the engine mounts (I'm still suspecting engine mounts) One trick the owner did to hide the vibration is to deflate the tires and blame the weather for the low pressure.

There's a difference on the way it drives now compared to when it was leaking..