My chevette does not evolve

Good morning, I am new here, I have problems with my chevette, loses pontencia and cylinders 1 and 4 do not burn, the camera decarbonize it and change the packages, but it remains the same, without burning. I have an income with the spark plugs since it carbonizes them because it does not work, I do not know what I can do, change filter, change the distributor's lid, and the caburetor no longer has to do it, if they can help me ... I would appreciate them.