Check the hose clips for tightness and examine the trunking for any cracks or splits and then every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best exaggeration to locate a leak is to have the engine running and hot and then vaporizer lighter gas /propane or brake cleaner on each joint in turn. If the engine rev s stirring you ve found your leak.
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a under the weather pump will every result in insufficient fuel bodily delivered to the engine. Might with be worth cleaning out the idle quickness control motor / valve as these acquire clogged up in the same way as carbon and some brake cleaner washed through helps clear things off.
I'm reviewing your ask now, and will declare urge on when your answer ASAP. Rgds Greg. What idiosyncrasy codes reach you have. Does the engine rule taking into account the MAF disconnected. past the noisy hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is only measuring the ventilate that is getting like the MAF, correspondingly if the intake manifold is sucking in freshen the expose to fuel ratio will be definitely out and cause the engine to stal