after i hit vtec in gear 1 and 2 sometimes.. and i slow down later to a normal pace.. my clutch vibrates weirdly when im shifting .. when i push in and stuff.. what coukld be the cause of this.. is this normal?

and sometimes when i hit vtec when its hot.. my speedo goes crazy....

and is the 5th gear supposed to vibrate when you're going like lets say 80 mph and let go of the gas pedal??

 

bumppp