1994 300zx na starting issues

[mistawright]

Alright guys this is what im dealing with now and I also hear a rattle from my transmission near the output to the driveshaft. I have a manual transmission in my car wondering if its low on fluid. But back to the issue at hand. I can't get the car to idle properly. it will hum around 1k and then dip out of no where.

[evildky]

I'd start by cleaning the iacv, they are known to cause issues such as this.

also, might need a new trans mount.

[mistawright]

ive actually got a new transmission mount. how hard is it to replace this guy?

[mistawright]

I replaced the transmission mount, I actually had a nismo one that I put in over the weekend. However I still feel some vibration from the tunnel area. Thought there is no more rattling from the transmission as I had heard before

[Ace2cool]

Is your drives haft carrier bearing intact or does it have some play in it?

[DCaff300ZX]

Alright guys this is what im dealing with now and I also hear a rattle from my transmission near the output to the driveshaft. I have a manual transmission in my car wondering if its low on fluid. But back to the issue at hand. I can't get the car to idle properly. it will hum around 1k and then dip out of no where.

Have you solved the idle drop problem? If so disregard...
I watched your video and the first thing I noticed is your temp gauge is reading pretty high, either you have a cooling issue about to unleash or you perhaps have corrosion issues with the coolant temp sensor, which is common. Corrosion of the various engine control sensors and controls is a major problem with the Z32 and having even partial issues throughout the bay can become a overall problem. The IACV itself is a VERY finicky b**** and often cannot be corrected due to age and crap buildup, needing new replacement and a new upgraded weather shielded harness. Same with CTS and PTU harness connections, and of course the injectors and CAS, etc.
I'd make a complete sweep of the engine bay connectors and carefully clean out any and all green crud, use di-grease upon reconnection and see what that gets you. Check all CTS/PTU/IACV connections (hose and electrical) and replace as necessary. The fsm also has a lot of tests and flow charts for these types of issues, which can help you get an idea of what you are up against and the various things to test.
Good Luck!