Why does your VR commodore run really rough after an lpg conv even when on petrol?
A VR commodore shouldn't run rough after an LPG conversion when running on petrol, assuming the conversion was done correctly. If it is running rough, there may be an issue with the conversion itself, such as an incorrect fuel mixture, vacuum leaks, or a faulty component. It's important to have the vehicle inspected by a qualified mechanic to diagnose the issue and ensure it is resolved.