The engine light is on in my peugeot 206 (2001). The engine is 1.1 l petrol. The car is stalling, struggling to pull off when started and when it does pull off it I feel it struggling, it vibrates heavily and feels like its chugging (cant think of other way to explain this). It was at the garage one month ago for this problem and they replaced the fuel injector, the car was ok for a while but like I said its started again. Any ideas what could be the problem?