Valve Adjustment
 

If when i adjust my rocker arms, i tighten them too much, will that cause the valves not to close all the way and have valve float?
I adjust them with the engine running and when i tightend one of them the idle changed slightly. Is that too much?

You have a hydrolic roller with a stud mount right? If so make sure the lifter is on the heel of the cam that you are adjusting, tighten down the rocker till you can't twist the pushrod by hand, then give the rocker another half turn then lock it. Do the same for all 16