Yea I have to assume that the fuel pump/filter is next to replace/fix. Injectors were all replaced about 20k miles ago.
Im going to doubt the oil has anything to do with it. Being a surface analysis chemist, I work directly with motor oil companies and wont even get into how big of a rip off they are.
To add more to it, when I start it and it has its rough start, if I hit the gas pedal, its about 4-6 seconds before the engine actually revs. This change/add any other thoughts or ideas?