When my vtec engages its bogs down really bad. Like its stumbles and falls on its face. It kicks in at 4400. I checked the spool valve and the other filter where the solnoind is on top both are clean. I have tested the vtec sol and nothing seems wrong. THe oil pressure switch I didnt test cause Iam runing a mugen program that bypass the knock sensor, oil pressure switch etc.. Could this be fuel related or not getting enough oil pressure? I dont know I would really appreciate any help on this.