I have a 2002 Subaru Impreza with many modifications. I was driving on the highway and tried to take some pulls with another car and I downshifted into 4th gear, floored it, the car took off like a rocket and then when I hit 4000RPM it was like if someone put the car in neutural and let go of the gas - when it really was floored. My check engine light also flashes at high RPM's, and my boost wont stay under 20lbs no matter what wat I turn my manual boost controller.

Does anyone know what this can be?

My check engine lights are :

1. P0444 Evaporative Emission Control System Purge Control Valve Circuit Low Input

2. P0447 Evaporative Emission Control System Vent Control Low Input

3. P0480 Cooling Fan Relay 1 Circuit Low Input

4. P1400 Fuel Tank Pressure Control Solenoid Valce Curcuit Low Input

I just got the car back from my local race shop and since then Ive had nothing but problems. They did a ****ty job and left allot of parts missing...simple parts that anyones mother would notice is missing. The shop gets a big thumbs down and I will never go there again.

My current modifications are :

Turbo XS FMIC, NX N'tercooler, Cusco Coolant Hoses, Zerosports Thermostat, PWR Radiator, Forced Performance Green Turbo, Ultimate Racing 880 CC Injectors, Walbro Fuel Pump, Manual Boost Controller, Rods, Pistons, GT-SPEC Headers, TurboXS Downpipe and Exhaust (catless), Turbo XS Utek, Perrin Fuel Rails, Tial BOV and WASTEGATE, ACT Clutch, Eibach Pro Kit, Strut Tower Brace, HKS Type 0 Turbo Timer, Short SHifter, HKS Circle Earth Grounding Kit, and more...