Sounds like you may be getting bolt stick, so it takes a few shots before the bolt cycles fully? What lube are you using? As it may not be suitable for cold weather. Set the dwell a little higher than the stock setting (whatever that is).my ion problem is well different lol basically instead of going bang bang bang it goess tut tut tut tut tut tut tut bang..... and i havent got a clue why, ive stripped it down cleaned it out, upped the dwell lowered the dwell everything, and its still tut tut tut bang
-Will