The B16A is DOHC, your stock engine is a SOHC D16Y8.

If your engine is stock, why are you running "agressive" fuel and timing maps? That's most likely your problem. Some generic "agressive" ECM isn't going to run all that well on a relatively stock engine that it wasn't tuned for. Put your stock ECM back in.

I'm assuming you mean the VTEC solenoid. Since your problem is most likely related to your ECM, I would leave the VTEC solenoid alone and deal with the ECM.

Beyond that, I would check all the normal maintenance items, especially ignition timing, spark plugs, distributer cap and rotor, plug wires.