my 440 has developed a steady miss that I cant figure out. Engine has a noticeable miss at idle especially when in gear.When it first started missing I pulled the distributor cap to find the metal tab on top of the rotor button bent severly. I checked the distributor out and couldnt find anything loose or worn so I went ahead and changed the rotor button and started it up. still missing. I channged the plugs and none looked bad. Went ahead and installed new ones anyway started it and the miss was still there. replaced the wires with a new set of accell wires and it still missed. When i started changing wires i found corrosion on the distributor cap sockets where the plug wire plug into so I changed it out with a new one.Still misses....Im running out of ideas here and starting to get really frustrated.....