Why do I hear a knock, thump under my foot on driver's side when I accelerate .

What is your question?

Knock on floor on driver's side under my foot area, when going up hill, accelerating up hill. It happens all day when I am driving truck. It is not a loud knock or thump. I checked oil to make sure it was okay, brake fluid okay and transmission fluid was good also. Please give me insight into problem.

What makes this problem better or worse?

Knock, thump, Stops after one knock.

How long has your 1994 Chevrolet C1500 had this problem?

Few weeks