Hello, I have repaired beyond 30000 vehicles in my career and I obsession to question you questions before I am not there in person to stockpile facts, data, or to test your vehicle. I may ask you to affect psychiatry in my stead. If assay is needed and you would rather not statute testing, I can find the money for my best advice, Fuel pressure?
Its next 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 all repercussion in insufficient fuel innate delivered to the engine. Might after that be worth cleaning out the idle eagerness govern motor / valve as these acquire clogged occurring following carbon and some brake cleaner washed through helps forgive things off.
I'm reviewing your ask now, and will state support in the same way as your respond ASAP. Rgds Greg. What irregularity codes do you have. Does the engine run next the MAF disconnected. next the loud hissing solid this could be your problem. This could be a large vacuum leak ,with the MAF linked it is only measuring the freshen that is getting gone the MAF, therefore if the intake manifold is sucking in freshen the freshen to fuel ratio will be unconditionally out and cause the engine to stal