last night i was heading home from work and when my temp is normal i usually start revving past 4k, well needless to say when i accelerated all was good until i hit 3800 and the car started bucking so let off tried again and same thing so i figure secondaries aren't working and i wonder why they wouldn't cause they've never giving me any problems. no today i decided to try my luck and they decided to work just fine so i'm a little stumped and could use some help on why they would so that. oh would the fact that it was 10 below last night have any affect?

 

my bro in laws 86 "luxury" did the same thing for awhile. ended up being that the secondaries came loose, not plugged in all the way. id say check that first.