I just had my clutch replaced. I dont know if this is related or not. Its been about 550 miles now and I notice that I get a lot of vibration around 4800-5800 rpm. It does it in gear and in neutral. It does it if Im flooring it or just babying it and slowly climbing up the revs, it also does it as the revs drop back down with the clutch engaged but not on the gas. Its a very noticeable vibration that to me sounds like its coming from the engine. It is fine from idle up to about 4800 and after 5800 is smooths out all the way to redline where its smooth as silk. Its fine at any MPH it just does it at certain RPM in any gear, even stopped and in neutral, it just seems to shake the car more when its in gear (obviously I guess). Any clue as to what this could be?