If the problem doesn't go away don't just assume it is the new air intake system, it is very possible that the idle air control valve might be going bad.
97_contour _sport
Added T-red wing
Cougar big brakes
DMD pulley
SS brake lines
Ford 9mm wires
21mm BAT bar
SVT motor mount
ES bushings
Metal water pump
ST200 badges & mats
ST200 UIM/LIM
Cold air intake
BAT Y-pipe