Gas Oven Ignitiion

Can’t Get Oven To Ignite. Ignitor Lights Up And Glows And I Can Smell Gas In The Oven. After 4 Or 5 Minutes Still No Ignition. Seems If You Have Heat And Gas It Should Light, But It Doesn’t. Can It Maybe Be The Ignitor Not Heating Up Hot Enough? Alo What Part Number If That’s The Problem?