Well took the GF down to school Aiken Tech in SC 9hrs. .... 30 min from Augusta, GA. Well on my way back home yesterday im cruising at 90mph (ive been doing a constant 90 for about an hour or so. Well next thing i know (still in SC) the check engine light comes on. and i went from chillin to pissed off lol. Well i took the next exit and hit a advanced auto that was down the road. (thank you GPS) they checked it and it was a cyl. miss fire. so im like ok probably just a spark plug that fowled. i had him delete the code maybe it was the 90+ speeds for an hour well got back on the high way and it comes back on. o well ill change the plugs today. Well the light is no longer on anymore???? Should i still change the plugs or what?