hi am a user of Peugeot 206 and its very nice and durable but i need a little help. 1.My car got over heating so i packed, after parking for 1 hour i check the is no water in the water tank so i decided to put in some water the problem is now the car has been jerking when i driving is that the cause of it. 2.My engine keeps going up and down meaning its not stable what may be the cause and what can i do to maintain stable engine. thank and hope to hear from you