Hi everyone,



I've got a 2006 Tucson V6 awd, and can't figure out what the cause of my issues are... The issues I'm having are the following



- Rough idle (gently buck's and jerks)

- drives ****ty but usable up until around half throttle, then feels like it's being held back/suffocating until full throttle, even then doesn't feel like it likes it

- Poor fuel economy. Went from ~10l/100km (23mpg) to now ~16l/100km (15mpg), light acceleration/highway cruising

- Hard shifting/holding gears longer than it should

- Backfiring/misfiring



I've replaced the following parts trying to fix it



- Fuel Pump

- Fuel filter

- Spark plugs

- Air filter

- Throttle position sensor



Any ideas out there from 15+ years of these cars (and others with the same engine) from the same experiences?