F350camper
BOOST!
You and prolly others will think I'm crazy, but this sounds electrical to me. You stomp on it, causing the motor to torque in the mounts, aggravating a loose connection which either cuts your fuel pump, or FSS or both. Whoosh sound is heard as turbo spools down abruptly, motor torques back, connection re-made, back off to the races...Actually saw 13-14 psi. Go down the road turn around. Stepped on it in second. Rpms come up and suddenly like a whoosh sound and motor changes pitch and I hear a knock I hadn't really heard before. Motor acted like it had a dead hole for a couple seconds then smoothed out.