Leaf Blowers

I purchased a new 350BT blower and attempted to start for the first time. It started right away but as I went to turn the choke off it would sputter. If I applied any throttle with the choke off it would bog out and cut off. I also purchased (at the same time) a new 525 trimmer and a 240 Chainsaw and filled them all with the same 93 Octane - Ethanol free gas and mixed with the appropriate amount of 2-stroke oil for 2.5 gallons of gas. Those other pieces of equipment are running great so I don't think it is the gas. I checked the spark plug and it was fouled with a black sticky/oily looking substance. I replaced the plug and the issue persisted. I checked the plug and it was starting to gather this same oil. I started the blower briefly with the air filter out to see if this could be a source of the issue and there was no change. Also noted the same black oil coming out of the muffler holes on the back of the pack. Have a feeling this is a decently significant issue. Plan to take it back to the dealer, but curious if anyone has had this same issue and what exactly might be causing this. 

Thanks,

Brendon