[Focus man. Focus.]

I think you need to take a step back for a minute. You keep throwing money at your car replacing 1 or 2 pieces at a time attempting to diagnose one of many problems. Maybe, just maybe try taking it in, somewhere and have them find the issue and fix it. It will probably be a bit of coin to have that done but in the end you wont be replacing everything 1 piece at a time. Just a thought. May or may not work for you, just a suggestion.