That could be a lot of thing's , stalling when ,cold ,hot ,idling , in gear , coming to a stop etc... Could have a vacuum leak , problem with IAC valve - idle air control , an one of a few different sensors could be bad , mass air flow sensor , coolant temp sensor etc.. You need to have some testing done , scan tool hooked up to check for DTC'S - diagnostic trouble codes , also check engine sensor data parameters . What engine does yours have ? 3.4 or 3.8 L .
Sensor/System
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Test for conditions which cause an incorrect idle speed.
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Throttle body tampering, excessive deposits, or damage. Refer to Fuel System Description .
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Restricted air intake system
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Large vacuum leak
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Inspect the air intake ducts for being collapsed, damaged areas, looseness, improper installation, or leaking especially between the mass air flow (MAF) sensor and the throttle body.
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Inspect crankcase ventilation valve for proper operation.
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Inspect the throttle position (TP) sensor and related wiring. Refer to DTC P0123 .
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Monitor the 24X crank sensor and the CMP sensor present parameters on the scan tool. If both are not responding, test the sensor feed circuit. Both sensors use a separate feed circuit but are internally connected to power. Test all CKP sensor A and CMP sensor circuits for intermittents. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
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Monitor the 3X parameter on the scan tool. If the 3X is not responding, inspect the CKP sensor B and circuits for intermittents. Inspect the ignition control (IC) circuit, IC timing control circuit, low resolution engine speed signal circuit and the low reference circuit for intermittents. If these circuits become open, or shorted may not set a DTC immediately, but are capable of causing driveability complaints. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
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Test the exhaust gas recirculation (EGR) system for proper operation. Refer to Exhaust Gas Recirculation (EGR) System Description .
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Inspect the transaxle range switch input with the vehicle in drive and the gear selector in drive or overdrive.
SOURCE: 2003 chevy impala ls starts then stalls
I have replaced the radiator in my 2003 Chevrolet Impala LS. The car started running hot and shut down. Took it to a radiator shop and found a crack in the radiator. I have replaced 2 thermostats in the car already. I noticed water running from under my car today and it seems it was coming back out of the overflow. I am stumped as to what is going on with this car.
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