Ok so let me start by saying, is like to stay away forma dealer for this if I can. Lately my 05 tc (manual trans) has been driving me nuts. It has this annoying feeling as if the car is coming down a hill with cruise on, but I don't have cruise on knor am I coming down a hill. It does it pretty frequently and it has no pattern! I've checked my plugs and there fine I changed them about 6k ago. I do have the check engine light on and it has a small vacuum leak. Im not sure if that can effect the air/fuel or anything like that or if it has something to do with injectors or fuel filter. I just need some help has anyone ever had this problem