2004 Monterey

Hi, I have a question. My 2004 Monterey van with 45,000 miles alway ran great, however with in the last 2 months as you are driving it I feel a slight surge while under a load. I'v Replace the fuel and air filter, there is no check engine light. I was wondering if anyone else had that problem, and what was the repair for it. Thanks for any help.

Mike