Question about 1990 Nissan 300ZX
The rpm's go up, down, up down when idling (as I stop at redlite.ect) I can let out on the clutch a little and it stops. It uses twice as much gas when it acts up. and when I start smelling fuel, I have to retighten the fuel lines...all the fuel lines have been replaced 2 times and still acting crazy, Please help
Is your check engine light on? Mass Airflow Sensor would cause this and make your light come on. Check this website it may give you some more insight to what could be wrong ... click on the tech section and there is two sections for erratic idling ......
Hope this is helpfull, but I would hook a scanner on it and make sure there aren't any codes also check the vacuume lines.
Posted on Jan 04, 2009
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Engine stall or RPM fluctuates
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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