i installed autolite 104s gapped .035 during the nitrous install and now the car seems to run a little rougher than before the work. city driving seems a little more rough not only a little surge but maybe a small miss noticeable when cruising. mainly listening to the exhaust i hear what seems to be a miss. its crazy cause wide open throtle is smooth no missing that i can feel anyway..btw the only other thing i changed was the converter went from the 3800 edge to 4200 vigilante that doesnt matter though right????

 

Its rare but possible you could have got a bad plug. Did you drop one at any point during the install? I'd check else where, what kit did you install and was there anything else done besides the nitrous and plugs?

 

Make sure all your plug wire are nowhere near being burnt on your headers

 

Start the car and pop one injector clip off at a time to see if the idle changes any. If you find one that doesn't that's your problem cylinder.
BTW.. it's not necessary to post up multiple threads asking the same question.