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I have a 2007 Fusion, admittedly a 14 year old car. Now ocassionally, when I shift into reverse, it will 'buck' twice, and then it's fine. At other times, it smoothly shifts. What causes the random bucking? Thanks, in advance.

I recently purchased a 2010 Ford Fusion SEL with about 70,000 miles on it because I loved the car. My Corolla needed to go with almost 200,000 miles on it and a blown engine--plus the dealership gave me a great trade in value I test drove the car for about a week and noticed it was a bit snippy with the 2 > 3 upshift and did a lot of research and read through many threads on this forum and found a lot of great info. I did take the car to the dealer last night explaining the 2 to 3 snappy shifting and I was told they applied a TSB (not sure which one, possibly 10B15?) after leaving it with them for a day (they also shampooed some of the seats for me) The best way to describe the issue is similar to something like a kickdown cable (which was a problem I encountered while having the Corolla -- not very expensive thank god!) But when the kickdown cable was damaged I remember the car would not shift smoothly, and often hang on to a gear before finally letting go to the next gear--it would just feel like a swift 'clunk' and then you'd be in the next gear. I never experienced flaring on the Corolla or the Fusion (just a slight one shifting from 3 to 4 but its not even 200 rpm and it's butter smooth). In addition, I haven't experienced any slipping while driving the Fusion. But the Fusion shifting from 2 to 3 feels EXACTLY like the kickdown cable issue with the Corolla. It's a real snippy shift, it doesn't jerk you, but you definitely feel it whereas the other gears you can hardly feel them at all. To my knowledge the Fusion does not have a kickdown cable is this correct? Also, the TSB 10B15 or any other TSBs after that should have at least addressed the rough shift, etc. but does it sound like I have something else going on? This problem only presents itself when I am aggressive with the car during acceleration, and then it will happen even if my foot is accelerating, but staying at the same position (not pushing or letting off the pedal, just in a position so the car will accelerate). This only seems to happen after the transmission fluid has warmed up when I get off the highway on my way to work. It never happens when the car is cold and has just been started. Any thoughts on this or any info would be greatly appreciated. I have already contacted Ford and started a service ticket with them in case anything goes awry. The transmission and engine still have 2,000 miles left for the dealer warranty.