Just purchased a 2007 E350 5.4L Van with 66k. It has a few issues, any knowledgable input would be appreciated!
1. It wanders a bit - I'm replacing the upper & lower ball joints next week.
2. It has a vibration in the drivetrain - replaced a bent rear wheel, but there's still some vibration. Any known problem areas?
3. The cruise control buttons fall off the steering wheel periodically - Seems like a poorly designed attachment. Any known fixes?
4. The keyless entry works only some of the time - I purchased a new Fob and a fresh battery, still works only some of the time. Any known fixes?
5. I would like to boost performance and fuel economy - On other vehicles I have played with Air Filters, Cold Air Kits, Cat Backs, Power Programmers, Throttle Body Spacers, Etc. Anyone have a good synopsis on options for the 5.4?

Thanks in advance for your input.