Need Help: WRX Problem

[976pgd]

I Have a 04 Subaru wrx with about 53,000 miles. The current mods on it are;

aps 3.5 turbo back exhaust
forge blow off vavle
cobb intake
cobb short shifter

As of a couple weeks ago I have been having some problems. When I Step on the gas pedal all the way to the floor the car doesn't go anywhere. The boost climes to 14 psi and the engine sounds ok but it doesn't go that fast. When I hit around 5000 rpms the car finally takes off. (It feels like the worst case of turbo lag in the world). If I feather the gas pedal and slowly push it all the way down It goes fine. Also when I hit 6000 rpms my car just (shuts down). It stays running but it feels like someone cuts off the fuel. Im hoping that a well needed tune up including spark plugs and fuel filter will take care of this problem. Does anyone have any ideas what this could be???

Please give me some ideas..

[perfusionista]

When I Step on the gas pedal all the way to the floor the car doesn't go anywhere. The boost climes to 14 psi and the engine sounds ok but it doesn't go that fast. When I hit around 5000 rpms the car finally takes off. (It feels like the worst case of turbo lag in the world). If I feather the gas pedal and slowly push it all the way down It goes fine.

This sounds like your clutch is slipping. V bad.

Also when I hit 6000 rpms my car just (shuts down). It stays running but it feels like someone cuts off the fuel.

This sounds just like the over-rev protection, which does cut off the fuel flow when you hit red-line, though 6,000 seems too early.

[btrenhol]

+1 to clutch slipping
sounds like fuel cut from the rev sensor not matching up with the engine speed.