[TalonEclipseMixGsx]

Alright man, well i just checked the good ol chiltons manual out. P0120 is your Throttle position Sensor Malfunction. P1500 says Generator FR terminal malfunction. (I honestly have no clue what that is) P1400 is a Manifold differnetial pressure sensor circuit malfunction.

Well the TPS is right on the throttle body, so check that and make sure its connected, no obvious breaks in the wire. P1500 i really don't know what to tell you. I've had that P1400 code before and it doesn't seem to affect anything. Check all your vaccuum lines and make sure they're all hooked up. They can cause the car to run shitty if one has popped off.

Have you tryed clearing these codes and seeing if they come back? My GSX loves to spit out random emissions codes, then i clear them and they dont come back. But then again with having alot of my emissions stuff removed im surprised the light doesn't come on more than it does.

I also just thought of something kind of weird. Are you venting your Blow Off Valve? I did this a couple weeks ago just to see what kind of sound the 1G makes. It sounds cool as shit but the car ran very shitty and stalled out on me a couple times at the stop light. I did get a TPS malfunction and that MDPS malfunction, along with a couple other codes that you didn't mention that i forget. So, in closing i would say if you have taken the recirculation tube off that connects the UICP and the Intake pipe, put it back on, unless you do the proper modifications to support it.