I finished my ZC swap a while ago and I've been working out the various problems I've been having with it. It hasn't been idling right and bogs under accelleration. My mechanic says the ECU doesn't know how much air the motor is gettting and therfore can't adjust fuel and ignition. I'm getting a code 4 (EACV I think), could this have anything to do with it? He thinks that the motor should have an air flow sensor, but I haven't heard anything about such a part on the ZC. thanx, in advance, for the help~ ~timE BTW: I have a '91 DX with K+N filter and a custom EG Si down pipe. I'm quite sure that all the MPFI wiring is correct.