MAF cleaner is the holy grail,spray all the sensors liberally with the cleaner such as the MAP sensors,CACT,TCBP,IAT,could have oil and dirt buildup inside,also throw a can of chevron cleaner inside the tank,some basic maintenance is always a good start especially with the GDI,and some TLC (tender loving care)is never to much for our engines and should never be neglected for optimum performance. Z