sputter after 4k

[tacoma]

not to sure whats goin on with my 1jz i have boost up until i hit 4k then it starts to sputter n i lose boost in all gears. does any one kno whats wrong?

thx Russ

 

[ft413]

mod list?

 

[tacoma]

mods list:

1jz-gte motor
154 speed manual trans
HKS intake/power filer
TRUST front mount intercooler
TRUST oil cooler
HKS relocation kit
Koyo race rad
Greddy oil catch can
Turbosmart blow off valve
Sun ground kit
TRUST downpipe
3.5" cat back
HKS super drager muffler
HKS EVC

 

[tacoma]

any help would be greatly appriciated

 

[1wickedA70]

gap down ur spark plugs..im goin thru the same problem..i gapped mine down to .025 and it got much better...juss have to gap them down to .022 and it should be completely gone....also upgrade the fuel pump to a 255 could be that too

 

[tacoma]

k cool ill try that rite now thanks. think it can be the coil packs?

 

[1wickedA70]

yea check for cracks on the coil packs

 

[tacoma]

i gaped them to .35 it got better. .22 wasnt too much? do you know wht the gap s in the manual?