3 Pending P0301 Code

So for the past week i've been getting pending P0301 code, no MIL yet but just a pending code that my Ultragauge has picked up, so far theres has been 3 P0301 code has appeared this week, im at 71k miles original plugs and the plugs do last at least 100k miles been an iridium tipped, Environmental temperatures 50*F Highs / 28*F Lows, i didnt feel the misfire when the code was pending code was triggered, and dealers won't do anything w/o a MIL for sure. Anyone experience these random misfires

P0301 define as the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #1.