I got a smokin deal on this 1/2" drive impact, but I'm not sure if I have enough air to use it at all. My old impact, which really just spins, spins till the air runs out. This thing farts for a minute and then blows air out the handle. I have been able to use if for brief moments. It did break the front pulley bolt loose when it seemed like it was half working. Any one using this gun on a low pressure? Should it act like this? Seems like it won't turn at all under 90psi, and I know for sure I don't have the 6.2cfm it needs. Maybe it wasn't such a deal.......thanks