94 honda passport missing

Ok I have a 94 Honda Passport with a 3.2 automatic. It is wierd, this thing when driving down the highway will have an intermintent miss. Some times its worse than others. It has happen before and last time I change plugs and wires and problem went away. No luck this time, I have change plugs, wires, coil pack, even cut off the cat, still same problem. The weird part is if you put in drive, hold the brake and press the gas runs great, but if you put in reverse and try it, it will pop and miss like crazy. Any help would be appriaciated!!!!!