Oven fills with gas Maytag Appliance MGR5780BDQ (by 2 users)

I have Maytag Appliance MGR5780BDQ

The ignighter glows, gas will come out of the burner but it will not light!

This happened over about a months time. I noticed a gas smell when using the oven and at the time it worked, but now it will not work right at all.

Now the oven fill up with gas but lights once the oven is full and blows up!! Very dangerous. How can the gas come out? And why does the safety feature not work??

I had the gas man out and he said I must have a plug in the line, making the gas pressure to low?? ( He is not a repair man for stoves so he might of been guessing?)

If this was the case then why do the burners work and why does the broiler work just fine.

The stove is fairly new, I think 3 years makes it fairly new!!

Thank you for your jelp.