I believe it can happen even if you have the stock intake setup...if you have it, you will know. The TH and Moose work as a pair in most cases.
1998 T-Red CSVT (1492 of 6535) Born on 5/30/97 KKM 4.6L TB with custom "Throttle Optimizer" Bassani Exhaust NP-Tuning Sniper Intake Pipe Fog Light Mod with 885's Clear Corners Stereo - Oh Yeah!