My 2003 sirion k3-ve2 1300cc cvt 2x4 is giving me grey hairs sigh

pls help someone...

i have changed spark plugs (NGK quad spark)

i have changed the coils

i have fuel flow and threw some injector cleaner into fuel (3x to make sure lol)

took it to be scanned ... apart from an abs warning on left rear wheel and a small cvt sensor issue there are no engine issues ???

anyone have any other issues i can perhaps look at

issue has progressively gotten worse and i am now unable to drive car safely as it tends to give the miss at lower rpms below 4500rpm and it is using so much petrol now (9km/l instead of the usual 17km/l)

I love my lil pocket rocket and wanna fix her up again so please enlighten me with your advanced sirion knowledge hehehehe