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04 Ion redline, just did a rebuild and it cranks strong without starting. I have these 3 codes. Anyone?
 

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Looks like your throttle position sensor is disconnected or no voltage is going to the sensors.

DTC P0120

Circuit Description
The throttle position (TP) sensors 1 and 2 are located within the throttle body assembly. Each sensor has the following components:

• A 5-volt reference circuit

• A low reference circuit

• A signal circuit

This provides the powertrain control module (PCM) with a signal voltage proportional to throttle plate movement. TP sensor 1 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. TP sensor 2 signal voltage at closed throttle is near the low reference and increases as the throttle plate is opened. When TP sensor 1 signal voltage is not within the predicted range, this code sets.

DTC P0220

Circuit Description
The throttle position (TP) sensors 1 and 2 are located within the throttle body assembly. Each sensor has the following components:

• A 5-volt reference circuit

• A low reference circuit

• A signal circuit

This provides the powertrain control module (PCM) with a signal voltage proportional to throttle plate movement. TP sensor 1 signal voltage at closed throttle is near the 5-volt reference and decreases as the throttle plate is opened. TP sensor 2 signal voltage at closed throttle is near the low reference and increases as the throttle plate is opened. When TP sensor 2 signal voltage is not within the predicted range, this code sets.

DTC P2101

Circuit Description
The commanded throttle position is compared to the actual throttle position based on accelerator pedal position and possibly other limiting factors. Both values should be within a calibrated range of each other. The powertrain control module (PCM) continuously monitors the commanded and actual throttle positions. This diagnostic trouble code (DTC) sets if the values are greater than the calibrated range.
 

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If you have fire and fuel only thing left is timing. Are sure you're not 180° off?
 
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