shuts off at idle starts up shuts off again if foot is not on gas pedal

Start by checking the fuel pressure.

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Moved to Chevy/GM truck mechanical and maintenance section.

Need some more information. Did the problem just start, how many miles, what maintenance have you performed in the past 18 months (tune up, fuel filter, etc).

Give us more information, you should get get some quick replies.

2007 surburban has 107000 miles had this problem for a bout 3 months off and on getting worst

like guns said, 100k is when you need to do alot of tune up stuff, plugs, fuel filter, air filter has any of that been done?

sometimes those engines get some carbon build up too i would open the butterfly and look in the throttle body

You will also want to check your PCV and EGR, both can cause stalling.

Not sure which engine you have but if it has electronic throttle (no cable) it does not have a idle air control motor. The electronic throttle motor and pcm control the idle. On models that have no idle air control motor there is a small machined opening on on the throttle body that prevents the throttle plate from completely closing. The back side of the throttle plate and intake can develop a large build up of carbon and oil from the EGR and crank vent systems. If you remove and clean the throttle body and what you can get at of the intake where the TB mounts, it may improve your idle problem. You may want to do a top end Seafoam treatment when you are done.

i changed the throttle body, it dose niot shut off now but it will not idle down when you start off and take your foot off the pedal the motor continues to run at about 1000 rps i do not know what to do next

Make sure nothing is binding up. Check the throttle position sensor, check for vacuum leaks.