Rough idle
1990 Buick LeSabre

Rough idle

(1990 Buick LeSabre)
ok i have a 1990 buick lesabre and about 3 weeks ago, it started it started idling kinda weird, it only happens when im in Park, when i put it in gear to drive it drives beautifully. Also if im at a stop sight or red light when i take off it stutters a time or two before it finally takes off. and thats only when i make a completely stop. if its a rolling stop (which how many of us dont make em lol) it will take off fine without stuttering. now around the time this first happened a spark plug wire came loose and was sliced by the fan. i temporarily replaced it with a wire that my dad had taken off his oldsmobile 86 when he changed his plugs, until i change the plugs on mine, which hopefully ill do this week. So could the problem be that wire that came from my dads car or something else? i recently changed the o2 sensor,
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