lean spot when shifting

[s13240sx10psi]

hi im new to the fourm but have been searching and reading for a few years. Here is my problem as soon as i shift i push the gas pedal back in a/f ratio will go to 13.-14.7 then way to 17.8 then back to 14.5 and then its fine untill i shift again. When im crusing the a/f ratio somtime will go from 13.8-15.5 back and forth this happens while doing 75 down the interstate. I have seen 30 diffrent kinds of cars and truck on diffrent fourms have the same problem but they never seem to fix the problem. if anyone can help me that would b kick a** below is a list of my etup and what ive done
s13 240sx with ka24det
redtop t25
370cc injectors
n62 blow thru maf
fmic
knock off hks bov
competition clutch six puck clutch
z32 fuel filter new
255 fuel pump new
new manual tps (auto ecu) problem?
new brk7s gaped .28 wires button cap
emance tuned ecu for 10psi
safc 2 (monitoring sensors)
im going to check fuel pressure this weekend and no vacume leaks, vacume read -24 at 850rpm please help!!!!!!!!

[s13240sx10psi]

bump could it be a exhaust leak ????

[compactfean]

Exhaust leeks usually cause rich conditions. Id say its in the tune. Maybe your tune is for a bov that is open atmosphere with out the blow through setup?

[s13240sx10psi]

That's exactly what I was Thinking I'm waiting for emance to email me about the tune

[compactfean]

Id also check your fuel pressure under vacuum. Maybe for some wierd reason under vacuum your fuel pressure is to low.

[s13240sx10psi]

Ok I will hopfully tomorow thank u for helping

[tyndago]

Its not an actual problem.

The problem is reading a gage with data that you need to fully understand. Is it a wideband 02? When was the last time it was calibrated?

The car goes into decel fuel cut off when you lift.

Cruising down the road 13.8 to 15.5 isn't an issue.

[s13240sx10psi]

The big problem is when u lift off the throttle to shift the wideband o2 will go to 14.7 give or take 1.0 then it will go to 18.0 then come back to 14. You feel it when it leans it drops on its face for a sec its a inovate wide band less than a year old maby five months its not the wideband or me. I'm still waiting on emance for a email. Hopfully I need a retune becouse blow thru maf. Thanks for sugestion though

[night_krawlers]

I'd agree with the retune. Try that first

[s13240sx10psi]

Yea retune fixed it diidnt think about the tune for bov before thanks for the help guys