My 2004 Impala is cutting out. At 1st I had thought maybe I got bad gas. Well then I had someone tell me to use Gumout to clean my fuel system. Well it's better.....but it's steady cutting out once I hit 45-50 mph or climbing hills. When I hook it up to the computer it says random misfire detected. My buddy said it's probably a bad coil. I am leaning more towards plugs and wires. But I am a girl and idk what I am talking about lol. Help guys!!