need input on this question

[snooper0069]

i have a 94 gmc sierra with the 5.7 . i replaced the plugs that came with the truck and put the exact same ones back in . its a copper plug and at idle does have an uneven slight miss to it . i have the gap on them at factory specs (35). i have a mechanic friend tell me to put some a/c 45 or 46 in and it would run better . i was thinking of putting the a/c rapid fire instead . anyone have input on this.

[frdfandc]

you said a "copper plug". Are they Champion's? What specific plug did you install?