2004 impala ss... Ill check the fuel trims in a bit, they shouldnt have screwed it up i called them and practically beat exactly what i wanted into the guys head. The rubber t is fine and the block off plates are fine. Sorry forgot to mention it started before the egr delete and pcm upgrade. I got the pcm because i thought since i have the headers and etc. i was running lean and needed to get more fuel. Basically I have it narrowed down to a bad/dirty MAF sensor or bad O2 sensor.