I finally just diagnosed my problems with my kick(may have seen my posts)and it turns out it is not getting enough pressure thru the egr port and it is not closing off the modulator so it is opening too early. No code! So to do a temp fix, I plugged the vsv vacuum port exit with a hose and screw. It still has not thrown a code even though I disabled it! My advice is, check everything! I have had cars with slightly plugged cats run good enough to where the power loss was barely noticeable, atleast minor enough to think the car was plugged. Kick-fix.com says the egr modulator needs 2 lbs. To push it closed. 4-5 lbs. May be messing it up? I'm not saying it is the problem but it could happen. Good luck on your fix!
KJ