I have a Kenmore gas dryer model #11087508100, getting no heat. I have

I have a Kenmore gas dryer model #11087508100, getting no heat. I have

I have cleaned the vents, taken the back vent off of it, and the ignite lights for 25 seconds and then only sometimes does the valve ignite but not a very big flame and it only stays lit for the longest 34 seconds. Most times than not the valve doest lite, one time I tapped on the valve and it lit, but not for very long and not enough flame to heat up dryer. Is there maybe a way the valve is clogged or something?

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