Ok so when I'm in a higher gear like 4th and doing about 35mph then let off and slowly get back on it around 29-30mph the car jerks, usually enough to jerk my head or shake my legs. Doesn't seem to do it in lower gears but even in 5th doing 40ish with slow acceleration it'll make the jerking motion. Sometimes it can be pretty bad, other times not so noticable.

Had a friend who drives a G35 drive it and he said the clutch is for sure fine, but that the jerking motion may be casued from bad motor mounts...? What do you think?

I'm also going to bleeding the clutch this weekend and if that doesn't help anything I'm just going to go ahead and have the master and slave cylinder replaced.

Car is a 2007 350z enthusiast with 55k miles and had the slave replaced in April of 2009 under warranty.

Thanks