Some questions.....
First, is there any chance the gun is adjustable? Lots of guns have an adjustment that actually dials up/down air flow into the tool that changes power. Read your manual.
Second, 90 psi is all well and good. How many Cubic Feet Per Minute does the compressor flow? Impact wrenches use a VERY high volume of air. If the compressor can not put out the correct volume at a high enough pressure, then the anvil will have no torque.
Third, how large is your air hose? If it is one of the coiled plastic hoses that come with most compressors, it will not flow enough air to operate an impact properly. It would however work to a point, just not well.
Skoot
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