Need help
 

Hi,
I have a 1997 type RB Bathurst. I have a problem. It has just started. My car runs fine mostly... But at times when i start the car after i have driven it for a awhile and parked it somewhere for a while... when i floor the accelarator it hesitates badly.. so bad that i have to take my foot off the accelarator.... Then sometimes if i turn the car off and then on again the problem goes away.... It all started a few days back when i got some fuel from a new fuel station....Otherwise the car runs great.... What could be the problem....