Idle problem

[fire90021]

I have a 1984 Datsun 300zx Nissan with a VG30E with a standard transmission. Just in the last month I have been having an idle problem after the engine get to operating temperature. When I cold start the car it will idle at about 1000 rpm but after it gets to about 120 degrees it is idle at 500 rpm and runs extremely rich. I have changed the MAF, throttle position switch,and checked for vacuum leeks. It still will idle at about 500 rpm, then after a couple minutes the motor will stall out.

My dad and I have tried just about everything that we can think of. So if anyone has some ideas please let me know.

[G-E]

Download the factory service manual, and check the parts that have to do with cold start ... alternately crack the throttle open with the set screw and make it idle higher

[evildky]

CHTS, if the car starts cold good but won't warm start or fuel fowls once warm it's likely the CHTS. If it's simply idle speed you might need to clean and adjust the ficv.