Hello! I have gotten my G tuned with FIC 775cc injectors, Admintuning 3in intakes, 340LPH fuel pump and a specialty Z flex fuel kit. I took my car to my tuner and everything went great. As he was driving the car around the trans began to slip out of gear and rpms float. The car has never done this before, he suspected it was the fuel injectors so we went to the stock ones but once again feathering the throttle is when the trans will slip and RPMs will float. Tuner is saying the car is throwing a TSB code and that maybe the ROM uprev sent is outdated. Has anyone had this issue before tuned or untuned? Could it be the intakes messing with the MAF because the tuner said he got MAF codes but has fixed them since then. Any help or anecdotes would be appreciated!

EDIT: Forgot to mention my car is 2013 and at 80k miles lightly driven!

 

You mean it didnt slip prior to you installing the intakes? Intakes could be throwing the MAF codes as they need to be scaled.
Have you tried uploading a stock ROM and see if problems go away?

 

Tuner is saying that he has scaled the MAF but going back to a stock rom is what he’s going to do today, although it requires some time to replace stock intakes so the stock rom can run again.

 

I’m getting funny rpm floats on mine, I’m bone stock on a 2010 X. Took it to a transmission shop and all the guy said was “it’s a busy transmission”. I’ve been busy with work ever since and haven’t had the time to have someone really look into it. I mostly find it does this in manual mode, where as my 09 X did not do this.

are you saying this could be the transmission slipping?