So im running a 98 stick with about 173k [yikes i know - highway miles]. it was serviced about 3 months ago. had to replace the crankpully whatnot. they also replaced my dizzy cap, wires, plugs at the same time. today i was driving down the freeway. i've never really got it pasted 110 so i floored it in 4th. got up to 125 and then my CEL came up. went to autozone and they said it was a P0303 - Cylinder #3 Misfire Detected. i've been reading the other posts and still kinda stuck. since i just got them replaced a few months ago could they still be a problem? if not what else could it be? thanks for the input.

 

Do you normally drive slow and in heavy traffic? Could it be carbon buildup?
Pull the plugs and swap #3 with another and have autozone check again.