Firm

when punch it and hit the higher RPMs my car starts to sputter and it feels like the clutch is slipping... but it also feels like there is back pressure that should POP out but it sputters instead... anyone have any idea what it might be or how to fix it?

Raptord

iTrader: (10)

If your clutch was slipping RPM would quickly rise but the car would not accelerate.

ReaperX

iTrader: (5)

If you're sputtering under boost I would always check the spark plugs first, might be time to change them.

Fastone_evo6

run the car in low speed an i high gear , ! and floor it , to make big enginge load ,
50/km i 5 gear , and your will notic if your clutch slips ,

Playap07

^^^^^ do not do that!!!!!!!!!!!!!

Has your car been tuned?

dastallion951

its not your clutch, clutch wont make u sputter. like someone above posted, your rpms will fly up but you wont go anywhere, that and the smell of burnt clutch are two obvious signs. Yours if it sputters, could either be a bad spark plug, coil boot/spark plug wire. Or possibly a boost leak. look around the intake manifold for a loose vacuum line, usually those issues will cause sputtering.
good luck

WolfsFang

iTrader: (3)

take a look at your plugs, mine sputtered and i took a look at the plugs, shot.

needmoreboost!!

iTrader: (9)

i had the same issue with mine. I changed out the plugs and all was good.

Firm

its not the clutch, i swapped the spark plugs, i put in a bunch of fuel injector cleaner in, i checked the lines and manifold and its still has rev issues... not as much as before but still there... if it was a boost leak wouldnt i feel that when driving slow?... the car drives perfectly fine until i punch it... then in the higher rpms it just doesnt want to POP!... it kinda just sputters then i shift gears....