mad boost + missfire when over 0.7 bar..???

[ziuziu007]

fitted manual boost controller,can not adjust it as the boost is starts after 4.5-5000 revs and its not controllable,and when riches the 0.7 bar starts to missfire...boost controller is good as i took it of my 300zx tt,it works perfect,adjusts perfect,so problem somewhere else....any one can advise pleas.thanks

[Br8n69]

It could be coilpacks or afm. If you could give out your spec list it might help others to identify it if it isn't those two.

[ziuziu007]

It could be coilpacks or afm. If you could give out your spec list it might help others to identify it if it isn't those two.

its all stock no mods.
what i dont understand is that with no boost controller under 0.7 bar its looks all fine no missfire or jumps in boost,,but as soon i try to put it under control and give a bit more preasure boost jump to 1 bar and terreble missfire,first i thought that it could be fuel cut off for safety,but never heard of that on overboosting...,,will try to check the sparkplugs they shold tell a bit....and coils....