Need Help

[choy]

hi i notice when i drive the car it loose some power after 5000rpm or when i press the gas pedal hard...

whats the problem?

what to do?

thanks

[erderr]

Sounds like it might be a misfiring towards the top end.

Do you hear any weird noises after you reach 4500-5000rpm? Are you running higher boost from standard?

If it's a misfire it will sound like this:

Most of the time it's due to spark which there are a few threads around the forums on how to fix the issue such as here: http://www.skylinesaustralia.com/forums/Fi...mp;hl=4500-5000

It doesn't have to be your coilpacks, it could just be you need to change/regap your spark plugs, but find out what your dealing with first before you go to try and fix it.