Just bought it off of Ebay. I was wondering what performance should I see from it?

Also I was at Sunshine Last Wednesday and when I pulled up to the line my temp was 212 and at the end was 180. It was running bad like hesitating and popping a little. Last week before that when it was realy cold out and my temp was like 180/190 at the line there was no trouble. Do you think it could be a coincidence, or do you think the 212 was a little warm?