I have a 2008 G37 S Coupe with a Stillen Intake. I have recently noticed at hwy speeds it felt kinda like I was driving in heavy wind. The car seemed to be holding itself back sorta. Yesterday, I went to take off at an intersection, when I gave it gas, it bogged down and stalled. Cranked back fine and idled fine until I gave it gas. Every time it would reduce RPM and stall. After turning it off and checking under the hood to make sure the MAF sensors were tight, and there was oil in it and nothing was loose. Got back in, cranked it up and it worked fine until running at hwy speed, still feels like it's holding back somehow. Any help would be great

 

What other mods do you have? If it's just the intake, that's an unusual experience. If you have lots of other bolt on's, it's possible that you are starting to lean out and need to get a tune to take advantage of the mods you have.

Reset the ECU and see if the problem persists. If it does, make sure you have the tubes installed correctly, and that they are seeing air.

 

Sounds like a clogged fuel filter or dirty MAF (maf would throw a code).

 

Clean your throttle bodies

 

Do you filters need cleaning? I was about due to clean my KN filters and I had been noticing that boggy feeling. Cleaned them out and my car feels like it's breathing a lot easier now and more responsive.