hey guys this is my first post...I just bought a 98 f150 4.6 with 80,000 miles. the next day after buying it the check engine light came on and stays on and the engine runs a little rough. also, when I give full throttle on the freeway or just reving it in the driveway the lights dim and the battery light flashes for a few seconds then goes off. I'm gonna take it to the dealer tomorrow but I was wondering what you guys think is going on??

thanks,
SOG