In case it has not clicked, a MISFIRE means no exhaust gasses travelling at super dooper velocities to spin the turbo.
I looked at someone's car on another site that would only boost to 2psi, the ONLY thing I did was regap the plugs and it went to 22PSI, and also got rid of the misfire.
Only a no cost suggestion, I don't care whether you take it or not.
tabetha