power loss.....

[tallduade19]

driving back home down the interstate last night.....and between 1/4 -3/4 throttle it sounded like i lost a cylinder and power wasnt there....boost was still building though......0-1/4 throttle no problems and 3/4 - full throttle no problem..........today was doing the same thing but had no combustion from 3/4 -full throttle and if i held the pedal down long enough i got a huge backfire........but sometimes it will run perfect.......any ideas?....maybe tps?

2006 wrx
ej257
cp forged pistons
delta utec
18g turbo
perrin front mount intercooler
850cc injectors
3" downpipe and exhaust
cobb short ram intake

[burton15]

I am having the same problem with my 04 WRX. What did you do to fix it. thanks