From Techinfo for 2000-2005:
DTC P0108 Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage
This could mean a few different things. If could mean a bad sensor, bad ground or some other minor issue.
First things I'd try would be to search the club for P0108. I did a quick one and it appears that once the suggestion of fixing vaccum leaks is made, there are no more responses. Like this one
If that doesn't work.. look over the wiring, ensure the sensor is plugged in.. maybe remove the sensor and ensure nothing is clogging it or the pcv.