P0108 - Manifold Absolute Pressure [MAP] Sensor Circuit High Voltage
P0121 - Throttle Position Sensor Circuit Range/Performance
P0122 - Throttle Position Sensor Circuit Low Voltage
A problem with the +5V reference from the PCM or either of these sensors could cause all of the codes that you are getting. The TPS sensor should output ~0.5V at closed throttle and ~4.5V at wide open throttle and should be a smooth transition between those values.
The MAP sensor outputs a voltage in response to the vacuum level in the intake. I have posted the normal atmospheric voltage outputs that should be expected in other threads and a search for "map+altitude" should turn that information up.