Swampcritter is correct. A manual intake valve cleaning will correct this and you won't believe its the same car. A word of caution: NEVER do a solvent based engine running cleaning!!! Damage will occur.
We make systems designed just for the LLT and LFX GDI engines that can prevent up to 85% of the coking while keeping your engine oil cleaner longer.
Tech@EliteengineeringUSA.com