Well, it sounds odd enough that you should probably just eliminate the obvious. Follow the quick check in this link for testing the IACV and ACC. http://www.twinturbo.net/nissan/300zx/forums/technical/view/1161018/Yes.html When that is done, ohn out the coil packs and confirm good grounds. Now ohm the injectors. All good? Throw your vacuum testing hockey puck in the intake and fill the engine with 5psi. Any vacuum leaks? Last, check the main harness connectors by the engine fuse box. Squirrelly shit can happen there if water gets in. Answer these and we will all have a better direction to point you in.
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