I would start by checking all the vacuum hoses like you said and make sure they are not broken and correded and leaking. A vacuum leak can effect fuel economy for sure.
SOURCE: Rear acceleration noise
Try rear wheel bearings. The cause a roaring noise that increases with acceleration. Sounds very similar to loud road noise.
SOURCE: knocking noise from rear when hand brake applied.
i recently had 4 tyres fittede and tyre company had crossed threaded one stud so forcing brake disc to be loose, hence when handbrake applied got thump from brake area.
SOURCE: Hissing noise when releasing brake pedal
Sounds like your brake booster but can't be sure until I know what kind of truck or car you have....
SOURCE: 2002 Mitsubishi Galant gets poor acceleration.
LOOK AROUND THE AIR INTAKE HOSE.MAKE SURE IT IS INTACT NOT LOOSE.CHECK ALL VACUUM HOSES ON INTAKE.MAKE SURE THEY ARE IN PLACE.
SOURCE: 2002 Mitsubishi Galant ''hissing noise''
I would first try to locate the source of the hissing. Try spraying some engine starting fluid around the hissing area and home in on the source. The engine revs will change as the starting fluid is drawn into the engine. Sounds though more like a vacuum as you have suggested.
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