My 03 LB7 seems to be loosing throttle response. When you step on the throttle, the truck goes, very slowly at first, and dosent start to pick up speed for about 3 to 5 seconds. I have changed my fuel filter last oil change, (4000km ago) and have recently installed a stage 2 afe cold air intake. Checked all the boots and clamps and everything is tight and secure. Was working great until recently. Dont know if maybe i messed up the mass airflow sensor when I changed it. Any help is greatly appreciated.