2001 Suburban with 5.3 Vortec idling too slow

-- Wife's suburban idles around 300 or 400 RPM in neutral and sometimes kills at a stop sign or making a turn. Have tried cleaning injectors with Techron injector cleaner and checked air cleaner. No diagnostic codes are set and scanner software shows no obvious problems.

- has anyone had this problem or can give some hints for finding the root cause?

Thanks for any pointers...

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jabitz
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