1. Faulty LPG System Components: The LPG system in your car consists of several components, such as the LPG tank, regulator, fuel lines, and injectors. If any of these components are faulty or damaged, it can cause stalling issues.
2. Incorrect LPG Mixture: The LPG mixture needs to be correctly adjusted for your car's engine to run smoothly. If the mixture is too lean or too rich, it can lead to stalling problems.
3. Faulty Sensors: Various sensors monitor the engine's performance and provide feedback to the engine control unit (ECU). If a sensor is faulty, it can send incorrect information to the ECU, leading to stalling issues.
4. Electrical Issues: Electrical problems such as loose connections, damaged wiring, or a faulty ignition system can also cause stalling problems.
5. Computer/Software Issues: If the car's software or ECU has been updated or modified during servicing, it may contain bugs or errors that can cause stalling.
Since you mentioned that the stalling problem started after servicing at Vauxhall, it's best to take the car back to them and have them investigate the issue. They should be able to identify the root cause and make the necessary repairs to resolve the stalling problem.