when i first take my car out (After letting it warm up for 5 minutes every morning) the acceleration is slow, i have to push about half throttle to make it accelerate like it normally does, and it is a little shaky as well, then after about 15 minutes of driving the problem goes away. valve adjustment? spark plugs? any ideas?

 

Well I can't speak for your throttle issue but I know mine tends to torque shake a little the first time I get it in fourth at around 35 mph or so till the tranny and rear end fluids warm up. And I live in the south. Only noticed it after the recent dip in ambient temps this season.