why is my car running like ***, i just put 1 step colder spark plugs(iridium) , did i do some thing wrong, is this common, i didnt gap them i just screwed them in , some one give me some helpful info , thanks

 

You should gap them if your running at least a 100 shot

 

a local shop told me to gap theam at 34 35 and it ran like crap, i put the stock ones back in and it still runs like crap, im just going to take off the nitrous kit and take it to the dealer so they can fix it ):

 

What does running like crap mean? And yes you need to regap them.