Going to get a set of NGK plugs. A Nissan mechanic friend said NOT to use anything else.

I concur with Anne G. Kay

What's the best tool to buy to test vacuum and fuel pressure? Also, where do you tap into the fuel rail?

I got a T and measured between the fuel filter and the fuel rail.

Equus / Innova Brand are the common man's low cost choice. Most autoshops have these gauges. Even some walmarts.

http://www.walmart.com/ip/Equus-3620-Innova-Vacuum-Gauge/14644669

http://www.walmart.com/ip/Equus-3640-Innova-Professional-Fuel-Injection-Pressure-Tester/14644670

Tested the vacuum and it's 13 HG at idle. I'm thinking this is way too low. Going to look and see what it should be

Can't find the vacuum info anywhere in the FSM

So are you now thinking you have a manifold leak? Use a propane torch, do not light the fire, start the car and slowley fog the intake with the gas while noting any spots that change the rpm.

I have replaced every vacuum line and no change. Will carb cleaner work the same? Don't have a good torch handy.

There are lots of things people use, carb cleaner, WD40 and the like. I like the propane and map gas because I dont have to hose my motor down with liquids, most flamable at that. Torches are cheap and very usefull tools.

Also I found a ground wire that screws to a bolt on the distributor under the cap. It has a bullet connector on it and is black. Where does it attach?

Well I have to wait a while to test again. It won't run

No change. No leak. I tried moving the AFM door in and out and there was no perceptible change in rpm. Is that right?