There are 10+ topics related to this issue but none of them is extremely clear about what the solution is. I've found numerous suggestions and frankly a ton of misinformation. I'm going to thoroughly document my symptoms and what I've done to attempt to alleviate them in this thread. It will be filled with video and photo aids.

Symptoms
When coming to a stop or releasing the throttle the engine RPM will dip down 200-400 RPM and then rise back up to 800-1000 RPM. During this time the whole car will vibration and stutter.

Here is a video showing the symptoms.
[media]http://www.youtube.com/watch?v=2oaUzk6TO40[/media]

Attempted Solutions

1. IACV (Idle Air Control Valve) I cleaned my IACV and split it open to ensure that the rotary valve inside would spin freely. Here is a video showing it spinning freely. This had no effect on the issue.

[media]http://www.youtube.com/watch?v=PYua1mv_GCg[/media]

Solution
Re calibrate throttle position sensor to .3V closed and 4.5 WOT.

 

The motor portion of the valve can be "clocked" quite a few degrees.

I have always set it to center. I have not yet experimented with other clock positions.

It would be worth running some data, particularly stft and tps at the instant of the event. Be sure tps is not momentarily dropping under min % on throttle snap-off.

 

Appreciate the effort, but the videos you linked to are private.

 

Woops, sorry about that. Fixed.

 

Good point. I actually just recently replaced the TPS that came with the car after having issues at a certain throttle position and finally having a TPS related code appear. I'll re calibrate the TPS tonight.

 

Mine does this as well. Always just thought it was heat soak

 

Good news folks. Checked my throttle position sensor. Voltage at closed was .43V and voltage at WOT was 4.8V. As a result my throttle positions were a little bit on the high end.

Closed


Open


From what I researched closed throttle should be 6% and open should be 90%.
After reading a round it seemed that the TPS values should be a tad bit lower (.3v closed, 4.5 WOT) so I re calibrated my TPS accordingly.

Closed


Open


And the result....

[media]http://www.youtube.com/watch?v=UXoCMI61Eoo[/media]

 

How do you re calibrate it? I'm assuming you need a special tool?

 

Just need a multimeter. I recorded my TPS replacement but I'm hesitant to upload it since I didn't replace the OEM unit.

 

So you have already replaced the TPS, and then you re-calibrated it?

I understand how to test the TPS with a multimeter from reading the service manual, but I haven't seen a procedure on how to adjust it, only to test that its outputting the correct voltage and increasing smoothly with no flat/dead spots.