I *HAD* a miss in my R33 GTST when the air was cold out side or I put the boost up high. This happened at around 5000 RPM, after many months of chainging plugs, coils etc, I finally know what is wrong and a fix (not sure how long the fix lasts!)...
(the reason it does it more when the air is cold is the Boost was higher due to more dense air)
Note: All Coils tested FINE with a multi meter - This is not a valid test for this problem!
after a really really good examination of the coils it seems that there were lots of scorch marks and some other really small marks, which looked like the spark was jumping from the case of the coil!!! Looking VERY closely, I found that all bar 1 of my coils have a hairline (almost invisible) crack on the front of the coil! (I will post a decent picture later):
~~~
--| <--- Ignition Plug
~~~~~~~~~~
~~~~~~~~~~~~
~~~~~~~~~~~~
~~~~~~~~~~ <--- Crack Here! Top to Bottom and on Some, Into Plug Tube
~~~~~~~~~~
~~
~~ <--- Spark Plug Connection
~~
(Sorry about my Crappy ASCII Picture!)
What I did was tape the lower half of the coil.
~~~
--| <--- Ignition Plug
~~~~~~~~~~
~~~~~~~~~~~~
~~~~~~~~~~~~
~~~~~~~~~~ <--- Tape here
~~~~~~~~~~
~~
~~ <--- All the way to here
~~
I no-longer have a miss!!... I put the boost up even more then before, and still no miss!! - this morning was nice and cool outside on the way to work - still no miss!!!
Anyone having problems with missing, just tape the coils you already have, use a REALLY good Stretchy Electrical tape... not the 25c crap you can buy (this was useless!) - I will have to try and find some high temp non-conductive glue and try it some time too!