So I think I've finally solved this problem. I've religiously been putting gas at Canadian Tire as my MasterCard is attached to the Canadian Tire chain of stores and gas stations so you get points everytime you use the card. The points can later be used in the store. Since the gas station offers 6x or 8x the points I always filled up there.

About a month ago I stopped going and went back to my usual Suncoco or Shell and the problem is now gone. Could it have been the gas? All signs are pointing to yes.

 

congrats for finally solving the problem!

 

Strange. Im having the same issue that it sounds like you had, though it has a direct relation to my clutch getting replaced. Its definatly more pronounced when the AC is on.

I figured I'd give it a month to see if anything would change. But it hasnt, so back to the dealer...

 

Joe, how many miles when the clutch was replaced? Was is it premature in your opinion? Clutch issues seem to have been a problem with a number of TSX's.

LT might end up with 35 at this rate

 

21,000...Considering I've had clutches since I've been driving, I consider this very premature. I didnt get a really good explaination as to why it happend. The only thing that I have changed now is that I dont downshift quite as often. But I've beat up on a Sentra and a couple of Toyota trucks and never had a clutch go bad on me.

Lets hope so

 

Thanks. Its really a big relief. Everytime I got into the car the vibration annoyed the hell out of me and made me regret trading for this car.

 

I have 06 and had vibration ever since I got it, now it's up to 1500k miles. I usually get 76 or Shell, but I think I'll give Chevron a try. Whether it's gas issue or something else, it sucks. I am going to ask dealer about it at my next service