I have 03 G35 coupe and following fixed the idle rpm irregularities.

How to reset your ECU and perform the Throttle Pedal Release and Idle Air Volume Learning procedures on an Infiniti G35.
Before attempting any of the following procedures, it is advisable that you read through the instructions thoroughly and familiarize yourself with them.
A stop watch or an analog clock with a second’s needle will be useful.
**a quick reset can be accomplished by disconnecting the negative battery terminal, and depressing the brake a few times.
ECU Resetting Procedures
Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON.
Operations Procedures
1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.
Accelerator Pedal Release Position Learning
Operation Procedure
1. Make sure that the accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.
Throttle Valve Closed Position Learning
Operation Procedures
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch to “ON”.
3. Turn ignition switch to “OFF” wait at least 10 seconds.
Make sure that the throttle valve moves during above 10 seconds by confirming the operating sound.
Idle Air Volume Learning (Throttle Position Learning)
It is better to count the time accurately with a clock.
1. Perform “Accelerator Pedal Released Position Learning”.
2. Perform “Throttle Valve Closed Position Learning”.
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Confirm that the accelerator pedal is fully released, then turn ignition switch “ON” and wait 3 seconds.
6. Repeat the following (steps 7a, 7b) procedures quickly five times within 5 seconds.
7a. Fully depress the accelerator pedal (HARD)
7b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the Check Engine Light (CEL) stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the CEL is ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure the idle speed and ignition timing are within the specifications.

Good Luck

 

oh i apologize, didn't see the screen name till now. idle reset sounds like a good idea, though i would find a mechanic with consult tool to do it just to be sure it was done.

 

ok I found out what was my problem the connector on the two coil packs was plugged into each other as soon as I plugged them into the correct plug car running smooth thank you all

 

Dammit! That doesn't help me! Lol glad you found the problem though..

 

Plugging wring connector incorrectly- wow how did you do that to start with?

 

be careful with the throttle body cleaner i did that once and the thing started running like it was turbo and threw a check engine light, they have a special coating around the butterfly that can not be cleaned....

 

Sorry for the re post but i see you seafoamed you car.. i have seen many videos on youtube done to 350z/G35 and my coupe has 91K miles on it.. did you see any performance pick up from this cleaner????.. i have seen guys destroy O2 sensors because of the burn off...

 

I did seafoam @ 90k and noticed nothing. I didn't really expect anything though. I guess the smoke cloud was cool lol.

 

I just got my car back yesterday and the shop had it for over a week. I had oil in the spark plug holes also and my car would shake a bit while in idle.
It literally just did it again a few minutes ago. Not exactly sure what all is going on with this car but I love it and I will drive it til I can't anymore!