My furnace is going on for a few minutes and then shuts off. The pilot is lit and it is igniting but is only blowing cold air and only stays on for about 2 minutes then the blower shuts off but the flame is still burning

Your no name and no model number furnace might have a bad fan and limit control or burner problem.

It is a coleman 7656 in a mobile home

Probably a bad or out of range fan control disc. Post at the link under Coleman your problem and they will have a solution. They also sell parts so it will save you some time and $$.

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