Pontiac Blower problems

I have a 2000 Pontiac sunfire which has had blower motor problems for a while now.

I’ve replaced the board behind the motor which is refered to as a resistor? The motor will start off strong, and die down to almost nothing after a few minutes. Amperage doesn’t fluctuate. I don’t think it;s the motor, but am not sure. Any ideas?

Tap on the blower motor with the handle of a screwdriver. Does it start running? It’s the blower motor!