Keep burning coils!

Hi there,

i bought a used k12 1.2 80cv years ago, with 35k miles, it went everything right until now. it has now 57k miles, and it started to shutting off during moving. i went to a mechanic, he changed timing chain, and everything went to normal.. a few miles later, i was driving, warning motor light went on, lost power, started to kangaroo, misfiring, it stopped. it was 2 burning coils.. it got replaced, i did a few miles, it burned again. they replaced again,few miles later, guess what, it burnt again. all original coils got burned, they are all brand new now, and it keep burning. i had to do car inspection, and it failed because of CO gas. my mechanic replaced rear O2 sensor for a universal one just for the inspection and it passed. now, i bought a original o2 sensor, and replaced it.

tomorrow i will get the car again, but i'm expecting that it will burn again. i want to hear some opinions, please!

sorry about my english, i'm portuguese :)
 
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