Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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Has anything been done with the throttle body at all for this issue to try and correct it?
Let me know so we can continue,thanks Pete.
O.k.,one of the more common issues that causes this here is carbon build up in the throttle bore.The bore plate will try and close but leave the small air gap to idle properly when coming to a stop.When there is slight carbon build up in the bore or on the bore plate this causes the stall out and can sometimes cause a surge as well as the computer tries to compensate to keep it from stalling out.
If you have not cleaned the throttle body yet I suggest using a shop rag with some cleaner like carburetor or brake cleaner sprayed on the rag to wipe out the throttle bore and bore plate.Then turn on the key without starting the engine for 1 minute then turn it off and repeat one more time.Then start the engine and allow it to idle for one minute.Then drive the vehicle and see if the issue still occurs.
If this does not correct the fault here let me know.
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The biggest issue in the transmission that causes this fault here is the torque converter lock up solenoid will engage on its own and locks the torque converter on,this will cause the surge then the load on the engine from the torque converter engaging will cause the stall out here.I have seen this solenoid fail several times before needing replaced.In some cases it may not set a fault code for itself acting up.
If you have not had the fault codes checked to see what codes are set this needs done.If any codes are set the codes set will need to be diagnosed to locate and repair the fault here.This may require the transmission valve body and solenoids to be checked/tested and a transmission fluid pressure test gauge to test more thoroughly to locate and correct this fault.This is usually best done by a dealer or transmission repair facility that works on this model here.You may have a torque converter lock up solenoid fault needing replaced.
I have seen some of the torque converters act up so I wouldnt rule it out but the solenoid that controls it is more common usually.The solenoids are electronically activated and then hydraulic fluid passes through them.Temperature can play a part in the solenoids acting up if you have a weak or failing solenoid causing this here.
I am still leaning on a possible issue with the torque converter clutch lock up solenoid as the fault or a possible issue with the torque converter itself.In some cases the actual valve body can develop debris in it and clog up passages and cause fluid pressure and fluid flow issues in the transmission and cause odd issues as well.I have had some luck flushing the transmission fluid out with a flush machine and adding new fluid as it is flushed to free up and remove debris from the transmission to correct some faults so this is an option that can be attempted.
Other then this,this will have to be tested further to pinpoint and repair the cause here.
Let me know if you need anything else and feel free to rate my help here.