I'd suggest you A) Get new spark plugs (I used to use NGK platinum 
tip) or you can use normal NGK's and just change them regularly and 
B) 
check the gaps on the spark plugs as well

If you're running a mine's ecu I'd also suggest checking your air 
fuel 
ratio when bumping up the boost to make sure its not leaning out. 
You 
may also want to look at upgrading your injectors and fuel pump 
depending on how much more boost you want to run.


--- In [email protected], "fuggie2001" <[EMAIL PROTECTED]> wrote:
>
> hey guys, i've been having problems turning up my boost. i have a 
> manual boost controller and i cant get pass 13psi of boost. when 
ever 
> i do the car stutters like. its like a restrictor or something 
that 
> wont allow me to go pass that.  i have a friend with an evo 3 and 
he 
> has the same problem. can any one help. i really dont want to use 
nos 
> for extra power. oh and my computer is chipped my mines. right now 
im 
> running only 9psi. thats stock boost rright?
>




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