Help..my 1989 300zx TT is dying!!

[mustang_piston]

Vaccum leak ..maybe idle air control unit(back of engine) White smoke..no sweet smell. Car engine shakes so much that it shakes the car. two weeks been bad...just started.. going down hill fast.Accelerate from dead stop dies sometimes.High rpms in park then let off..dies sometimes.My idea power transistor.(How can i get a warranty for a transistor..Im in japan I need one from the states) just touch injector wires and car boggs down...brittle harness may need change.I drove 15 miles and parked smelled BAD!!! like hot bad..Cold then i start up testing the engine in park..smell lots of fuel. came back to test..and wheeewww fuel smell alright. Engine in low idle ..not idle irratic..just the engine shakes a lot and sounds like a diesle. Louder then normal. Like maybe one injector not working. With all the infoI gave..can you help!! Thank you.

[180fan]

Time to give the iacv a good hosing/cleaning.

The shaking is probably related to the low idle. If the injectors ain't workin, give one plug a pull at a time. If you see a difference in the idle, that injector is working. If it isn't doing a thing to the crappy idle, yeah that injector's kicked the bucket.