The furnace comes on OK. But when the blower motor comes on the flame in the firsttube from the left looks like it is shooting back out torwards the front of the furnace. It makes a popping sound when it does this almost like a low backfire. It is a goodman.

You have a hole in your heat exchanger. VERY DANGEROUS TO USE. Extended exsposure to carbonmonoxide will kill. Time to call a service company.