Random high idle

[Asenecal]

Hi I'm having an issue with high idle. 1990 300zx n/a. Usually sits at 1400 to 1600 rpm's only on warmer days and when the car has fully warmed up.. The odd part is if I step of the gas and let off real quick the rpm's will drop back down to normal. Tried cleaning and adjusting both throttle bodies and replaced my tps. Any thoughts?

[elecfus]

"The best way to set the TPS is to use a Consult interface such as Nissan DataScan or conzult. This allows you to quickly and easily see both the voltage of the Throttle Sensor and condition (ON or OFF) of the Hard Idle Switch.
After loosening the two small screws holding the TPS to the driver's side throttle body, rotating it will change the states of the two sensors. Rotating it clockwise lowers the Throttle Sensor's voltage, and rotating it counter-clockwise increases it.
There is a "sweet spot" found while rotating the TPS where the Hard Idle Switch will turn on WHILE the Throttle Sensor reads between .4v and .5v. A common method of failure for the TPS appears where these two requirements cannot be met at the same time. That is, it can be set to show voltage between .4v and .5v, but the Hard Idle Switch shows off. If it's set to a position where the Hard Idle Switch turns on, the Throttle Sensor won't be in the proper voltage range (often around .3v). Owners will often set their TPSs to in the ~.4v-.5v range, but without the Hard Idle Switch being on, the car will idle high (between 1500RPM and 2000RPM)."

https://z32.wikispaces.com/Throttle+Position+Sensor