My 95 chevy truck idles rough and dies when i put it in gear and hesitates when i take off from a stop

Can be a number of problems start by checking the vacuum lines for crack or leaks then fuel pressure -if low or cutting out change fuel filter and check fuel pump==-check -clean or repair /replace egr valve clean first with a carb cleaner valve usually builds up with carbon -check and clean or repair throttle body possible clogging-or adjustments