P0402 excessive flow

I have a 04 3rz the check engine light came on with code p0402 (excessive flow) I cleaned the iac and the egr (with carb cleaner). The egr seemed ok. It moved up n down when I added vacume to it. And after I installed it. I added vacume to it. And the motor stalled. (Isn't that what's suppose to happen?) all the vacume lines are good. for some reason the check engine light came on again. Should I look at something else? Or should I just replace the egr?
I checked a couple forums. I can't seem to find a straight answer what it could be.

 

someone must of had this problem besides me.

 

Sounds like a cat flow issue

http://urdusa.com/Electronics-Rear-Sensor-Simulator/c66_170/index.html

I have high flow headers and before the URD rear simulator I had this code, but I have a V6

 

I believe this is one of the more common codes. Could be as simple as an exhaust leak or bad o2 sensor.


Scratch that, dyslexia got the better of me. I was thinking p0420

 

I just noticed that the r port on my throttle body was going to the vacuum switch valve. And not to the r port on the vacuum modulator. And the vacuum modulator hose was going to the R port on the throttlebody. Let see if that makes a diffrence.
I'm going to be kicking my self in the ass if that was the problem.

 

Be sure to post up if it was the issue!

 

I will.

 

I can confidently say that I fixed the problem. It was two vacuum hoses that were switched around. I've been driving around for a couple days now with no check engine light.
Thanks for all the hell everyone.