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2003 LM7 IAC and fuel trim lean issue


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my 2003 suburban set a P0171 and P0174 code, lean band 1 and 2, I noticed that the IAC output with my scan tool is stuck at 310 counts and does not move even when it's commanded to any other value (per the scan tool). I do not have a rough or poor idle, I do notice that my mpg has degraded. the Fuel trim values are upwards of 25. Could this mearly be an electrical connection issue at the IAC, could the issues be related, I would think that a malfunctioning IAC would cause a poor idle issue but it idles fine, cold and hot. It seems the sensor output is wrong. Would an open output cause a high count value.

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