Fiat Linea: Engine warning light on, unstable engine and loss of power

The symptoms you're describing could be due to a number of issues, but a common cause is a malfunctioning Mass Air Flow (MAF) sensor. This sensor measures the amount of air entering the engine and if it's not working properly, it can cause the engine to run poorly and lose power. You can try cleaning the MAF sensor with a cleaner specifically designed for this purpose. If the problem persists, it might need to be replaced. However, it's also important to get the error codes read from your car's computer. This will give you a more accurate idea of what's causing the check engine light to come on. Please update us on your progress.