I have a 1990 GT. It hasn't been driven for about a year or more but it has been started and let run bout 30 min twice a week. I recently have moved and when I drove it over to the new house it acts as if it wants to die at around 2500 to 3000 rpm. I have changed the plugs and fuel filter twice. It has dual exaust with no catalitic converters. Straight pipe from the shorty headers back to the mufflers. Cant figure it out. Any help would be greatly appreciated.