ok well first off, if im not mistaken, a fuel relay will not effect your vtec. vtec is ran off oil. you need to go everything that you changed over in the ls vtec swap process. check your ecu (find another one and try it out), check the wire from the ecu to vtec sol. also check your oil pressure. usually when the iac goes out, the idle will be very high, at least thats what has happened to me, or a sloping idle.also check your dizzy wiring very well, exposed wires, bad grounds etc...