I have a 2007 gxp. I bought it brand new back in '07 so I am the only owner of this car. A week ago I noticed it was idling VERY rough. I mean the whole car would lurch side to side like it was an old muscle car with a full cam. I got out, opened the hood and started looking around for something obvious and found the fitting for the pcv valve was broke off the intake pipe. Figuring this was the problem, and the fact that it still rode OK at highway speeds, I drove it home and parked it. I came on this forum looking for a solution and found several recommendations for the DDM Works silicone intake tube, so I ordered one. I just installed it and it seems to be a little better, but it still has a very noticeable "shudder". Do I still have a leak a where the pcv valve attaches or is it possibly another problem altogether? Thanks!