i am making a 2d halo mgame were you play as master chief but when you walk the object jitters and slows down. and with no animated sprite he goes a good speed with no jitters . also i need to make the enemys shoot at master chief and attack him with out going throu walls please help

it sounds to me like your in over your head. If you want to make the game discribed you will probly need some knowledge of the game maker language.
To make master chief not jitter, try turning off the "precise collision checking" box in the sprite itself. as far as the shooting goes, make sure your walls are checked as solids in there object forms. Good luck with your game.

well i know how to make the bullets stop but cant make thenemys shoot and attack the player. the help on turning off "precise collision checking" helped thanks

i know this isnt exactly what u r looking 4
but this will show u how to make a AI auto fire
http://www.yoyogames.com/games/show/37930

thanks this realy helped