I'm only quoting this to see if this is what i should do to check for wear.While the air box is off to test things, take a look into the intake ports, by turning the ign. key on the secondary throttle plates will open fully, turning the key off while they're open will leave them open for easier viewing into the intake port. Holding the throttle wide open after doing that will open the primary throttle plates, and then you can see inside the port. If any of the intake valves are 'bad' , that particular cylinders intake port will be very dirty looking (with carbon build-up) All ports should look the same (clean), Good Luck !
What do you guys think, is this the easiest way to check?