Happy fourth everybody!

today i did a minor tune up. I replaced the wires, cap,rotor and spark plugs. Everything seem ok. It was a real PITA to get the cap off. I did finally get the thing off and put on a new rotor and cap. I may have cracked the cap because i did hear a slight craking noise when i was tightening the three screws.I am pretty sure i installed the wire correctly. I will go back and check to see if the spark plugs are seated.When i took my car out for a spin,it seemed ok when i giveit alittle gas but when the car was idling,i could hear a slight missing.It's only slightly miss. Any help is appreciated.thx.