Car stalls out at stops

First is your car still under warranty? If not we are working on an 09 Tiguan that wants to sometimes wants to die out at stops.We are replacing the in tank fuel pump and fuel pump control module.

Check the automatic idle control valve on the engine. Sometimes all it needs is a good cleaning.

If it's fuel-injected, you may need to have the injectors cleaned, and also, any air filters should be changed at the same time along with gas filter/s. If it's carbureted, the same as above, but have someone clean the carburetor completely. Make sure all air hoses are attached correctly, securely and NOT broken. If broken, replace them.

The timing belt/chain could have jumped a 'tooth'.
Did this 'new' behavior start all-of-a-sudden, or did it slowly get worse??

Dean

You might want to check for a busted fuel pressure regulator diaphragm. With the engine running, pull the vacuum line off the regulator. If gas comes out of the regulator, replace it. For the acceleration issue, check the signal on the map sensor. It should change drastically when you open the throttle.

The powertrain is still under warranty. Call the nearest Hyundai Service Department & look into it. There's a good possibility you can get this problem diagnosed & repaired under warranty.

If it's an automatic, it could be the torque converter solenoid. Symptoms are stalling when coming to a stop after reaching speeds of 40mph and above. If it restarts immediately then stalls after putting in gear, that's what it is.

Is it carbureted or fuel injected? If it is carbureted, there may be a float problem in the carburetor causing this symptom.

If it's a carbureted system, maybe the idle speed can be adjusted with a screw. Not sure on the Chevy Spectrum.

Is this Chevy Spectrum the carbureted model or the Fuel Injected model?

If carbureted maybe the idle stop solenoid is bad.
This will be located near or on the carburetor throttle cable pulley.

replace the map sensor it is very easy and relatively cheap