Let me preface this by saying that I'm a huge fan of FPS (first person shooters) and Gran Turismo. I've been nearly dedicated to COD4 since I got it at the end of Nov. My issues started shortly after entering Prestige mode for the first time. I noticed that when moving forward, all I could do was creep with the occasional burst of running. It looked like a lag induced issue. I have 6Mb DSL and I'm only 1/10mi away from the main connect. So, I couldn't immediately blame the internet connection.
A fellow gamer suggested I reset the controller. I did this and it improved the situation for a week or so. But, this no longer has any effect. This past week, I started experimenting with different movement patterns, ie. rapidly zig-zaging in a forward motion, and noticed I could move in a forward direction faster but, still not as fast as the other players. So, besides earning the nicknames, Gimp and Handicap, I've determined that the controller needs to be replaced. Apparently the signal from the left joystick is inconsistent when pressed straight forward. I've also lost the ability to run which is the L3 (pressing down on the left joystick).
However, I'm curious if there is a fix that I can perform?