i have a 1997 concord got a miss when uder load like when your sitting at a redlight but dosnt seem to miss when driving. if some one could give me some ideas.it says random missfires.new plugs,new injector,wires

Welcome to the site. I will move this thread to the first generation Intrepid section,
FF

Check you Fuel pressure. you mat have a bad pump. or a bad coil pack.

a bad fuel pump doesn't cause a miss at idle and run fine at road speed. and the same goes for coil pack. (which I've never seen go bad)

vacuum leak or EGR valve leak will cause miss at idle and still run fine at speed.