1998 Questions for all other cars peugot 106 (1998 model)

Engine problem
1998 Questions for all other cars Engine Size unknown Wheel Drive Type unknown Automatic 77000 miles

Hi
I have a peugot 106xL 1.6 engine 1998 model.I have just realised that my car has a very bad oil leak & leaves a big puddle on when parked, the car also cut out while I was driving and a lot of smoke comes from the exhaust but seems to disapear when the engine is warm. Also the cat light flashed on while I was driving. Do you think I could have damaged my engine while driving & why such a big leak. Is it expensive to fix?Another problem I have (before leak)when I'm driving up hill or sometimes even on a straight road, the car seems to struggle and makes a noise & once when I was on the motor way the car could seem to kick into 3rd gear and the speed started to drop could the sound and speed drop be pinking?