Snow Blowers

I have a new ST227P snow blower that trips any GFCI circuit I use to try and start it. I've tried the two circuits in my garage and one on the exterior of my house and the GFCI outlets trip immediately. I plugged the extension cord into an interior outlet (no GFCI) and it started up fine. (I used the same extension cord on all the circuits; and one of the garage circuits has a 1.5 hp air compressor that never trips the circuit). What gives?