Peugeot

My peugeot 206 1.1 petrol engine keeps loosing power. last night it lost power, i can only get the car to around 30mph maximum in like 2nd gear. this morning it was working great so i took it to the garage who checked all my plugs, points and distributer and all was tested 100%. the garage had changed the catalytic converter as this was diagnosed the cause of the problem. tonight i went out and again it lost all power and i had to nurse it home getting no more than 25mph. the battery seems fine as it starts first time e time. the rev counter seems to bounce to around 400 revs and up to about 1100 revs and back again. the engine has quite a loud chapping noice as if its not firing on all cylindes.regardsjamie c

Sounds like the coilpack is faulty as this would give the same symptoms.