ok really what the heck is Limp mode....was reading posts about it and have no clue what it is

 

http://wiki.answers.com/Q/What_is_a_limp_mode

 

Your engine management and maybe even your transmission is controlled by the ECU. As you know, all computers crash, all software has bugs, and mechanical equipment fails. As such, many ECU units are fitted with a 'limp home mode'. When it detects that something semi-serious is wrong, it enters the limp mode, which means that the engine won't rev beyond a pre-programmed speed, you can't accelerate very fast, or you may indeed be speed-restricted to 40 mph or similar. The transmission may even stay in one or two gears. Bad? Well, no, not really: The alternative would be to either let you drive at regular speeds, with the danger of letting you trash your car (expensive repair, means happy repair people, but angry driver), or stopping you from going anywhere (expensive recovery and stranded on the side of the road means happy recovery company, but angry driver).

TAKEN DIRECTLY FROM GOOGLE

 

It will usually go into limp mode if it detects a sensor failure so it can't do its job running the engine. Then it usually will default to a predetermined value for that sensor and will throw a code, rev limit to a low RPM, and run really rich for safety. It will also go into limp mode if it detects a hardware failure, such as a corrupt chip, incompatible program, etc.