The problem doesnt ly in any other part of your vehicle. The problrm lies in your vehicle fuel injector's they are leaking. Replace them with brand new one's and you are good to go. Its your decision whether you keep wasting your money on unusual things which dont need any replacement and keep on hit and try method.
Or you go for the injector replacement and save your precious money and time.
You are the first one whose problem is not resolved yet. These vehicle maintenances are not a diy project for a normal person. Without the knowledge of basic things of automotive. Dont waste your time comparing the faults other people had experienced. In automotive industry every vehicle has similar symptoms but 5 out of 100 had same faults. other had same symptom but had different faults... I described the solution to your problem. Have peace and stop wasting your time.