okay i got a ls turbo i wanna boost 12 pounds but for now im running 5 i wanna run 8 at least till i get a dyno tune but everytime i pass over 6 psi my car starts sputterring like 2step or like a rev limiter was hit , i can be going 4k rshared_pm on 3 full throttle and if it passes 6 psi it starts doing t hat and wont really move so if forces me to shift early. Could it be a fuel cut off?? or wat?

 

what plugs and gap?

 

boost leak maybe , also +1 on the proper plugs and proper gapping

 

Most likely plugs. Could be detonating...hope this thing was tuned, although sounds like the answer is a big no.

 

Could be a couple things.

Do it once, do it right. Take it to a dyno.
Blown motors are never fun.

 

oh ok well i got the ngk r flushed down , wat space am i supposed to put them ??

 

kk and no boost leak just exhaust leaks , but its street tuned

 

if you have a street tune on 5psi dont up the boost. leave it as it is. save some cash and do it right.

 

i got a street tune for 8-10psi but i did a full tune up and didnt know about the spark plugs being gapped , what gap should i have on them

 

what map sensor are you running?

If it is stock this is most likely your problem and will need to be upgreaded.