Spark Plug Gap For 1998 Z71

[BowTieZ71]

Anyone know what the plugs need to be gapped at for a 1998 Z71? I have no owners manual and the truck is lagging and running bad, I got the order of the wires correct. They are AC Delco plugs. Code coming up is "misfiring on random cylinders" Thanks guys.

[greentourismo]

what motor? and it will say the plug gap on the sticker thats on the front plastic cover under the hood or on the airbox