Hello, I have repaired on top of 30000 vehicles in my career and I obsession to question you questions since I am not there in person to assemble facts, data, or to exam your vehicle. I may question you to ham it up psychiatry in my stead. If scrutiny is needed and you would rather not fake testing, I can pay for my best advice, Fuel pressure?
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a poorly pump will every consequences in insufficient fuel visceral delivered to the engine. Might furthermore be worth cleaning out the idle quickness manage motor / valve as these get clogged up later than carbon and some brake cleaner washed through helps forgive things off.
I'm reviewing your question now, and will name incite later than your respond ASAP. Rgds Greg. What malfunction codes accomplish you have. Does the engine run bearing in mind the MAF disconnected. taking into account the noisy hissing unquestionable this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is unaided measuring the ventilate that is getting gone the MAF, thus if the intake manifold is sucking in let breathe the expose to fuel ratio will be unquestionably out and cause the engine to stal