Ive had this issue as well. Usually tgese kind of issues are related to fuel and lubrication. Im running the new Pennzoil pure plus platinum (its the only GTL base stock oil, which i hate to say actually surpasses our OE oils and is on par with our higher grades) and did a dose of p.i. with Lucas UCL mix. Changed out the plugs, cleaned the intake, cleaned the CCV and oil seperator. I did a long run before the last oil change driving non stop till the gas light came on, filled up with V power, mixed another does of UCL then let it sit (amsoil P.I. has Polyetheramines or PEA which clean as the vehicle sits. Next day did the oil change and now shes runnin like a brand spankin new truck....well aside from the trans issue that needs to addressed lol.

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Do your car and move up to Amsoil.