1998 loss of power please help

Good evening this is the first post I have made on this forum!! I look foward to all your help! I have a 1998 LeSabre with about 51000 miles on it! I have the 3800 motor but am having a problem that I need help with! Just recently it started happening when I excell from a read light it seems to have a little studder before it goes! When I push the gas pedal it goes but them it seems to "pause" then goes again its seems like sometimes it will do it like 3 times go "pause" go "pause" then go again but then once I am going its fine its only when I excell!! Please help me with what you might think that it is! Or if you have anymore questions let me know Thanks TIm

You might have bad gas. Happened to my wife's car. I had to change the fuel filter after I got that tank of gas out.