Hello, I have repaired more than 30000 vehicles in my career and I craving to ask you questions before I am not there in person to gather facts, data, or to test your vehicle. I may question you to bill chemical analysis in my stead. If breakdown is needed and you would rather not comport yourself testing, I can manage to pay for my best advice, Fuel pressure?
Its furthermore 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 all repercussion in insufficient fuel living thing delivered to the engine. Might next be worth cleaning out the idle enthusiasm run motor / valve as these get clogged stirring in the manner of carbon and some brake cleaner washed through helps free things off.
This could be a large vacuum leak ,with the MAF connected it is solitary measuring the expose that is getting in the manner of the MAF, for that reason if the intake manifold is sucking in expose the ventilate to fuel ratio will be no question out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. considering carb cleaner spray can vaporizer in the place of the hissing in the same way as the engine meting out and considering you hear the engine stall or rev far ahead there is the leak ,could be a bad vacuum hose bad gasket on the manifold.