Recently bought vr4 that hadn't been running for 3 yrs. Turns over/cranks, but won't start. Has spark. Has fuel pressure. We think the injectors may not be working, but not sure because there is power, 12V, to the injectors when ignition is on. We also took an MFI relay from another 3000GT and that didn't help. Could it be the ECU and are there are any less expensive repairs we could try first?

Any advice is greatly appreciated!

It could be an ecu or the ecs computer. Is the tour/sport suspension light flashing or does the ecs work normally? You can take out the ECU and check for leaking capacitors as well.

Since it hasn't run in a while it could be stuck injectors. Try spraying some starting fluid into the intake manifold and see if it will fire. Keep spraying to keep it running and it might clear up the stuck injectors.... that is, if the ecu works.