I'm going to add my issue here, since I haven't found any other place to post it. I have a 2012 GT that I bought new about two month ago. Currently have a little under 1,200 miles on the odometer.
I love everything about the car, and even with this issue, I'll live with it. However, I would like to get it fixed. I suppose I could take it to the dealer, but if there's a way around that, I'd opt for it.
Here's the situation:
1. The car has been having a "stammering" issue since shortly after I bought it. After I got a few miles on it, I started punching it every once in a while. It's difficult to explain what it did, but the closest thing I can relate it to is a fuel or ignition issue, like it's missing out, but just barely. It's hardly noticeable, but it's there. Something isn't right in the fuel, ignition, timing, whatever, that's making it accelerate in something less than a perfect response.
2. About a week ago, I noticed it surged when I started it from a cold start. The tach was bouncing from 600 to 1,200 back to 600, back to 1,200. It did that until I backed it out of the garage and started down the street. But when cold, it seems a little unsure of itself at slow speeds. After the engine gets warmed up, it gets back in control, but when you punch it, there's still that acceleration issue. A passenger probably wouldn't notice is unless they were a mechanic with years of experience in tuning cars. But as the driver, I can feel it.
Any suggestions short of taking it to the dealer? I have not disconnected the battery since I brought it home. I'm using Shell 91 octane fuel. I wonder if I should put a bottle of that water absorber in the gas tank.
Someone give me some input here. It's driving me nuts not knowing what's wrong.
2012 5.0 GT - 6MT82 - Sterling Gray - Premium Sports Interior - Comfort Package - 18" Polished Aluminum Wheels