Starts then dies. :(

[CamShaft]

Okay, I have a 95 Zenki with 185,000 miles on it. I bought it a couple months back with no major problems. But now, I have a some problems.

I'll try to explain it as simple as possible.

I've got 4 CEL Codes
P0505 - IACV
P0325 - Crankshaft Position Sensor
P0335 - knock Sensor
P1336 - Some random crap that's probably from the Crankshaft Position Sensor.

My car starts fine when it's a cold start. But when I've been driving it for more than 10 minutes, turn the car off, turn the car back on about 20 minutes later it just starts (shoots up to about 1200 rpms then dies on me). No matter if it's in neutral, 1st, 2nd, 3rd, 4th, or 5th. So when I want it to idle, I have to help it by feathering the gas or else it will die on me. One of the error codes is for the IACV and I thought that it would be that but it's confusing me because it only works when it wants to. It drives okay (still beats Hondas) but it just cant hold an idle MOST OF THE TIME. I don't know what's wrong here. Please help me out guys.

Thanks, Cam.