Do you have a gas-thru grip or reg on it? If so, try taking it off and screwing the gas directly into the bottom of the marker. The Inferno doesn't require a low input pressure, so this way you can at least see if it shoots fine. If it doesn't(assuming you really have air)
, the problem is internal(probably a bad o-ring somewhere.). If it shoots fine with the gas directly connected, swap out the reg/gas thru (use the same line from the other one). If it works, fine. If not, you might have something in your line. Swap it out and see if it works. If so, play ball. If not, get back on P8ntballer and ask for more help.