2004 quest. 135k I just wanted to share my experience. The codes were for knock sensor, 3 cylinder misfire, High idle.
Removed the intake: the two green plugs have to be disconnected from bracket
The hot water circulation pump is easily removed by spraying soapy water while peeling back the rubber mount. That way you can remove pump from rubber mount for clearance. Remove the studs from intake and the egr connection. I was able to remove the knock sensor bolt with a long 1/4 drive extension and a impact swivel socket. I did not remove the entire intake assembly. I used a longer bolt and bolted it to the intake in a easy to access place. Check out attached pictures.
The plugs solved the misfire.
I cleaned the throttle plate valve it was pretty gummed up. That solved the high idle prob.
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