My car had a problem only betwin 5,000 ~ 6,000 rpm

all rpm to 5000 engine pulling good 5000 ~ 6000 lost power

6000 ~ 7200 rpm pulling very nice

what happen ?????? I just replace MAF Sensor

And this is my mod

Nismo Cam
9.5:1 CP Forged Piston
Pauter PRO Rod
Sard 255 Fuel Pump
Air Power Systems F.M.I Twin Turbo Kit
Greddy Type-RS Blow-off
Greddy e-01 Boost Controller
Bosch 550cc Injector
B&B Exhaust - 350Z w/ 4" Elliptical tips
Kinetix with In-Line Resonators Cat Delete pipes
NOS 135 Wet Shot of Nitrous System
Progressive Nitrous Control System
UR Pulley kit
Techno square ECU reflash = " L " Spec
HKS Twin Power ignition amplifier
KOYO 53mm Racing Radiator
Samco Radiator hose kits
Kinetix SSV Plenum
Aqua Mist Water Injection System
Aeromotive Fuel Return System
Aeromotive Fuel Regulator
Next Gear Thermo shield Intake Manifold Gasket

 

PLS Help me ???

I get Missfire 5000~6000 rpm only............

 

Suggest you post this in the FI. section. You'll get responses

 

Did this problem start after you chaned the MAF Sensor?

 

No even befor change