Need help im stumped!

ok heres the problem, at full throttle my car would sputter at high rpm's. it wont even make it to redline. when i apply the throttle slowly i can get it up pretty high without sputtering (1st gear).when i do it with some other gears i get a lil bit of sputters.

ok so first i suspect boost leak. i retightened all the clamps and same thing. by the way im running a blow thru set up. correct if im wrong, but if it is a boost leak its only critical if the boost leak is after the maf? if it is a boost leak its somewhere on the manifold that i cant find, any ideas? oh and my idle sucks sometimes(it would die) and sometimes it fine. my vac is at 15psi

next i suspect the spark plugs. i am using ngk bcpr7es gapped at .8mm. maybe the spark plugs are too cold and gap to little? any advice?

im also suspecting the timing since i havent check the timing of the car. i dont really know what the procedures are, if you have to set it to timing mode or what not. also whats the base timing and what do you guys set your timing at?

also someone said that it might not be getting enough fuel. i am running a t3/t4 set up .60a/r intake and .63 a/r exhaust, im still using the stock 370cc injectors with safc2 at 8psi of boost.

also my engine temp is not working, it was working before now its not. dont know if that matters.

sorry for the long post but im stumped!

oh by the way this is a RB25det