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Old 01-29-2010, 04:24 PM
M_Six M_Six is offline
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Join Date: Jan 2007
Location: Charleston, IL
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Check the DISA.

From a friend: It opens and closes a flap in the intake manifold to give you more torque in the low RPM range and more power in the upper RPM.
At <3750 RPM a solenoid is energized which controls the vacuum to close the flap, it allow air to enter thru one tube but at a higher velocity for more torque output.
Above 4100 RPM the solenoid closes, the flap opens and air now enters thru 2 tubes increasing the volume needed for high RPM and power output.

I had similar symptoms as you when mine went.

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