gregando

sorry for asking a silly question but should a coil pack fit tight to the spark plug like a plug lead or a sloppy loose fit? I am asking as this is the first car ive had with this type of coil pack set up and i am unsure if they should fit over the plug tightly or fit loose and rely on the four bolts to hold them in place. i'm sure that my coil packs are stuffed as they are a very sloppy fit on the plugs and the car is missfiring like a bastard .