Hey guys, I'm hoping you can help me with this. I have an 02 wrx that hesitates/chokes at about 4500-5000 rpms in any gear. It lasts about a second but it bucks pretty hard, feels like it is not getting enough fuel, and then it revs fine all the way past that. 02 sensor was just replaced, spark plugs are fine, fuel filter is clean, fuel pressure is fine at idle. The turbo is also fine, and replaced air filter and tried driving without downpipe on. Nothing seems to fix it.
I did some searching and saw the coil packs as a possibility, as well as the fuel pump at higher rpms. Originally took it to mechanic for running lean CEL, but CEL is not on now and doesn't seem to be related to the choking at 4500rpm. I have done some searching so if I missed an obvious response to this please forgive me.
Thanks for the help