hello new member here i have a 94 Z-28 lt-1 auto runs real rough when you start it misses real bad new coil plugs wires fuel pressue is perfect exhaust pipes are real black car runs rough like i said but if you stomp on it it goes strong but misses and back fires a little ive been tracking this problem for a while please help pleaaaaaassee!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1

 

one of your cylinders arent firing so first thing you need to do is track down which one it is. after that concetrate on what it might be. you say you changed the spark plugs and wires?