when i accelerate on the gas it make's a Popping noise from engine i believe.

What is your question?

when i drive the car at some point there's a noise which sounds like a loud pop.but as i drive with my foot on the gas at the safe rate of speed it's OK. if i let off the gas. and retreat to accelerate on the gas it make's a pop noise. what would you think is wrong with this car. could it be the timing belt or the bad vale. thank you for reading this.