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2006 Saturn ion redline
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5 Volt Reference Voltage Incorrect
P0641 - Engine Code
Throttle Actuator Position Performance
P2101 - Engine Code
Accelerator Pedal Position Sensor 1-2 Correla..
P2138 - Engine Code
Throttle/Pedal Position Sensor/Switch 'A/'B'V.
P2135 - Engine Code
Throttle Position Sensor 1 Performance ,
P0121 - Engine Code
 

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Sounds like the throttle body or the accelerator pedal
 

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Did you ever figure what was going on? I have a similar issue. Been chasing the P0641. Its intermittent so it’s a bugger. I have P0523 A/C pressure snsr a circuit low. P0641, P2135 and P2138.

I found that the 5v reference is shared with the MAP, MAP for SCIP, CMP, Baro, A/C pressure sensor, FTP sensor. APP sensor and TB.

If you have a DIgital multimeter. You can check the 5v on one of those connectors and and start wiggling and and unplugging the connectors for those components mentioned. While looking at the meter for any big changes the 5v.
 
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