just got an ibex ignition 3, and the splice fork on it seems to not want to take in any air...

every time i try and pump it up at all, when i unscrew the valve on the shock pump, it releases ALL the air pressure, regardless of the initial PSI.

this is a coil spring with air (preload?) adjustment. any help would be great. also any suggestions on a good psi for a 150 lb rider...