Do you know the exact name of the grease? Would home depot have it.Blue Bomber said:WD-40 = bad for rubber boots, bushings, and hoses. It will eventually eat away at them. Use white lithium grease instead.
Pop open the hood. If you have a CAI or short ram intake, this will be easy. Look behind the intake, and you'll see some gold linkages. Spray all of their joints, and you squeaking should go away. If you don't have an intake, try to spray around the stock airbox to hit the linkages. You can also remove the driver side undercarriage plastic to get to them.