Sapo I'm still having a power cut issue in my 4th and 5th gears..1-3rd all run great under boost through the whole RPM range, but when I'm on it in 4th or 5th the car starts going in an out of power, like a boost or fuel cut. The think is, my AF and boost are perfect while its happening. Fuel is around 11-11.4 and boost is at around 12lbs(set by wastegate and AEM tru boost). Now when I'm on the highway on 4 or 5, it will go through the whole RPM range at half throttle, but if I go 3/4-full it will hit the power cut issue....Earlier tonight I was in 4 and went to half throttle and REALLY slowly rolled on to full(like really slow, was almost shifted in to 5th by the time I got to full). Then I got off and mashed it again, power cut...Once again I can go full out 1-3 without an issue....But I soon as I get into fourth power cut....There are no check engine lights or anything

Any ideas would be appreciated..

Also it seems to have a rough idle sometimes, don't know if thats normal or not. Idle make the car sound like it has cams but it doesn't?

Car is a 1999 GS300 NA-t, 62mm turbo, 255 pump, 650cc injectors...Running Haltech FX10

Here is actually the first time it happend, just happend to be taping...
http://www.youtube.com/watch?v=6vq2W...ature=youtu.be

 

Do you have a way to check your boost level? Boost gauge would help alot. Or better yet if you could datalog. I had a similar issue and found that I was having boost spikes that were causing the ECU to shut it down. I would definitely check that out first.

Are you still using MAF or have you converted to MAP sensor. If MAF, the car under boost is sending a value out of the preferred range of the ECU and could be causing it to cut out.

 

Yeah it has a AEM tru boost gauge/controller... Doesn't seem to be spiking anymore than 13 occasionally, and its only in the 12lb range when the issue occurs....