sudden loss of power in peugeot 106, 1400 Diesel mardi gras?

whilst driving started to go up hill when heard a popping noise and the car lost spead and came to halt(Engine was still running) manageged to drive home but every time i change gear power droped drasticly, never got above 50mph. when i got home (About 3 miles) there was a buring smell from under bonnet?