After I changed my plugs today, I noticed the car was idling kind low and then it would rise to normal levels. I decided to try a wide open run and I niticed a small miss/ hesitation through 2nd and 3rd gears. I have shecked to make sure I put the leading and trailing in the right place. I can't figure out whats wrong.

Could it be a bad plug? has anyone had this? I need help fast I am running a autocross school this weekend and wanted the car to be in tip top shape.
Thanks for the help

 

make sure the the plug wires snap/click onto the end of the plugs.

 

I had the same exact problem the first time I had my plugs changed. I had a local shop do it for convience, on my way out of there I noticed it missing when I got on the highway. Went back and told them a plug was bad. They said it wouldn't be a plug, probably the wires, I said it never did this until you put in the plugs, they ended up changing the plugs and all was perfect.

So, yes, you can get a bad plug. Take them back and get more.