This is a new development. 2010 Evo x GSR just under 30k miles daily driver. While driving on the highway (tested this with all gears) if Im at steady speed in either 3 4 or 5 gear ad ~3500rpm and I floor it the rev jumps like its building pressure, drops 500 revs then continues to build up. Clutch isn't slipping, plugs are good, and hoses aren't leaking. I cant figure it out. I did have a cobb tune on it for 9 months now and de-tuned it to stock and the issue didn't go away. Has anyone had this issue before?

 

Mods on car? Are you the original owner? Have you tried logging with the AP to see what was going on?

Could be a myriad on things but too little detail to comment.

 

have you checked the vacuum line everyone warns about?

 

the only mod are the tune, k&n filter wheels and an hks turbo timer. i am the original owner and i checked the hoses and they were connected firmly but i cant check for a crack in the hoses

 

go to autozone and get new hoses if you even think there could be a crack. they are cheap, and better quality.

 

Fuel pump relay?

 

turns out its my clutch heating up and loosing grip sad thing is its getting worse every single day so it really must be on its last legs

 

Initially I would have guessed clutch but you said it was ok. Nevertheless, 30k for a stock clutch is not too bad.

 

I was about to say clutch too the way you described it. I would baby the car and try to find a shop ASAP. The longest it'll last is a few weeks if its a daily.

I'm about to hit 30k and I had to go up an big incline of about 70 degrees from a stand still so had to slip the clutch a good bit. It was seriously felt like going straight up. I'm kinda worried about mine now. It seems the engage point higher although I did a couple pulls and it seems really good.

 

well just so you know i didnt baby mine at all i kicked its *** so dont think that 30k is the average life expectancy of these things i live in southern california hitting the canyons on the weekends and i drove across the country

 

Has the car been reflashed from the dealer? Theres and update...

 

no it hasnt