hesitates

hello, ok I have a 1994 buick century 3.1 bought 3 years ago with 29k miles now has 66k miles. Car has always run perfect like new, decided to change plugs and wires since manual said they should be changed at 30k. Went with the autolite double platinum plugs and wires. Old plugs looked worn...

Need advice. At stoplights the engine seems to stop for a nanosecond. Keeps running, does not want to stop running, but has this interuption momentarely. Want to fix b 4 getting stranded !! 177,+++ miles. Has been, is running well, except for this. Alan