Troubleshoot me!(engine codes inside)

[tsiboostin]

O.k, on the way back from Broad ripple last weekend the Galant threw an engine code. It seemed run fine on the way home, so I thought it was minor. After I turned the car off, and then tried to start it back up it would not idle worth a damn. Once you had it running, it would try and die whenever you gave it gas. The plug for the mas has came undone before, and that is what it ran like when that happened last time, so I checked that first. The plug was connected to the mas, so then I proceeded to check for any big boost leaks. I could not find any leaks visually that would be big enough to make it run this bad. So then I checked the engine codes. This is what I came up with from reading the sweeps.

Code 12-Volume air flow sensor
Code 13-Intake air temperature sensor
Code 21-Engine Coolant temperature sensor
Code 25-Barometric pressure sensor

The check engine light has never been on before, so these must have all came at once unless some were saved in the memory. This is the thing. The car has a 2g mas, so the wiring has been redone. I have glanced it over, and the connections look to be all soldered and heat shrinked. Also, when I unplug the mas there is a noticeable difference in the way it runs, so that leads me to believe that the wiring connections are o.k.

Sooooooo... with these codes and the information from above, what do you guys think?

 

[weldtuner]

Is there anything else done to the galant other than the 2g mas? I think you need to check out the wiring with a multi meter to make sure everything really is "OK", as well as you engine temp sensor.

 

[tsiboostin]

Will do. The galant has the basics. Fuel pump, injectors,20g, fmic, etc..