The "shoosh" you're hearing is from the turbocharger. The engine RPM is dropping quicker and the drive pressure on the turbine side of the turbo goes away thus causing the boost pressure to come back out through the compressor inlet. No biggie.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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