Help!! Problems with 2012 Focus

[Rihannon90]

First post on the forum, just wanna get some advice and/or help with my 2012 Ford Focus.
It's an auto, 2.0l, dual clutch system, petrol.
I haven't had it very long, bought it second hand, but one month into owning it a noticed a shuddering. It happens when I accelerate from low speed and when going up hills.
I have taken it to one Ford dealer and they said it was the clutch housing, so they fixed that. It then continued to shudder so I took it back to them. They said they couldn't feel any shuddering on a test drive and told me they couldn't do anything. I figured they just palmed me off as my new-car warranty was due to expire in a few weeks and that way I would have to pay big bucks when the car pooped itself. They also said it is a characteristic of the Focus. What I don't understand though, is why they fixed the clutch housing and told me it was that, if it was just a "characteristic".?!?!?!?
So today (had to wait a week due to Easter) I took it to the dealer I bought it from. They did all the diagnostics and couldn't find anything. I went for a drive with one of the foremen to show him what it was doing and he said it could just be under little throttle.
They then suggested I take it to another Ford dealer to see if they could find anything. So I'm booked in for next week.
I would like to know in the meantime though, if anyone else has had any problems with shuddering and what I can do about it. My new-car warranty is up on the 19th of April this year, so if anyone can help me quickly, I'd appreciate it. Otherwise, I'll be trading this lemon in for something that doesn't shudder.