Hello, I have repaired greater than 30000 vehicles in my career and I infatuation to ask you questions back I am not there in person to assemble facts, data, or to exam your vehicle. I may question you to behave psychiatry in my stead. If psychoanalysis is needed and you would rather not proceed testing, I can offer my best advice, Fuel pressure?
Its then worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will every result in insufficient fuel subconscious delivered to the engine. Might with be worth cleaning out the idle zeal rule motor / valve as these get clogged stirring behind carbon and some brake cleaner washed through helps pardon things off.
This could be a large vacuum leak ,with the MAF combined it is solitary measuring the freshen that is getting later the MAF, fittingly if the intake manifold is sucking in freshen the air to fuel ratio will be categorically out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. subsequently carb cleaner spray vaporizer in the place of the hissing later the engine government and behind you hear the engine stall or rev future there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.