Check the MAF connection. Make sure it's tight.
Remove the negative cable and wait for a few minutes (1-2), and then plug it back in. Start the car and listens for leaks.
If all else fails, reinstall your stock intake and see if it happens as well.
Did you recently change your oil btw?
11 Nissan Altima 2.5S Special Edition
50% Front Windshield Tint
45% Front Window Tint
5% Rear Window Tint
OEM Nissan Scuff Plates
Steering Wheel Audio Controls
OEM Fog Lights
OEM Splash Guards
All Weather Floor Mats
OEM Spoiler with LED Tail Light
Interior Third Tail Light Deleted
Leather Steering Wheel
Special Edition Badge
Upgraded Torque Rods