I have an AIRAID FIPK installed on my truck and once the engine warms up I am getting a whistling noise coming from the AIRAID. I have tracked it down to the hose that attaches to the AIRAID intake system and goes to the valve cover. The whistle only occurs at idle when the throttle plate is closed. It seems that the suction created by the closed throttle position causes a resonance in this hose. Has anyone else experienced this problem and what if any were your fixes.

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1998 RED F250-LD EC 4X4 Lariat, 5.4L, 3.73LS, 4WL ABS,
LOAD LVL SUS, TOWING PKG, SUPER COOLING PKG, 6 CD
CHANGER. GREY LEATHER INTERIOR.

MODS: PACESETTER TFX CAT BACK EXHAUST
AIRAID INTAKE SYSTEM
SUPERCHIP FLIP CHIP
MAG-HYTEC DIFFERENTIAL COVER
NAPA CERAMIC BRAKE PADS
BFG ALL/TA KO LT26575R16
FORD MOLDED MUD GUARDS
DURALINER W/ BULL RING TIE DOWNS
MAX SUPER WHITE HEADLIGHT & FOG BULBS
DASHMAT DASH COVER

FUTURE MODS: JBA HEADERS
STULL BILLET GRILLS
MAGNACHARGER BLOWER

 

I am not familiar with this system but try this. I looked at the installation picture and viewed this setup. When the noise occurs pull the PCV valve out of the other valve cover and see what happens. Second, try reversing the two hose for the left side valve cover and the IAC valve supply hose.