Okay so I have a 2001 Nissan Pathfinder with the 3.5 4x4 5 speed... It idles rough and when you drive it almost feels like it's got a misfire but I have no misfire codes I do have codes p0505 p1336 and p1490 but I don't feel like those codes could cause my power loss and the vibration... It idles like **** and vibrates the whole vehicle when I'm on the gas when it's coasting off the gas it's smooth like it should be it also has a harder time than usual in the low rpm range under load.. the vibration like a misfire happens the entire time gas is applied but more noticeable in the higher rpm range say 2000 to 3000 rpm any tips or info would be greatly appreciated