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You probably have either a bad blower motor or a bad start capacitor. You need to test the voltage to the blower motor after the burners fire up to confirm this.
Most likely it's best to call in a pro for this given your description.
If you don't know how to use the meter then you can't verify the culprit. The call prompt is automatic. I have nothing to do with it
The other (less likely) possibility is a bad fan control. You need to do some voltage testing to confirm which one is the culprit. I have been called away. I should be back in less than an hour. I'll respond when I get back if you have more questions.