2012 dodge durango AWD v6 90k
 

when i take the shifter to park and hold the brakes a very noticable rumble will start and continue till the brake is released.
recently cleaned out the throttle body. and replaced the thermostat.
no dtc codes being thrown.
engine light is on, maybe cause i havent solved coolant up to temp in time yet, why i replaced thermostat. p109 i think it was.

Vacuum Leak ????