hey.. got this 95 sunfire and when i bought it it had no head on it.. so i put a head on it and drove it for a few weeks and then the timeing chian snaped.. took out all 4 excuast valves and cuz'ed a big mess.. well anyways i fixed all that and got it running agen and it ran for a bout a week and it seems i have poped the chain agen.. has anyone had this problem befor

Thanks