Hello, I have repaired on top of 30000 vehicles in my career and I dependence to question you questions in the past I am not there in person to accrue facts, data, or to test your vehicle. I may question you to accomplishment examination in my stead. If laboratory analysis is needed and you would rather not appear in testing, I can meet the expense of my best advice, Fuel pressure?
I started the car up this morning, it starts occurring and runs at 1750 and within a minute or so climbs higher than 2500.. It is executive serene though, just way progressive than it should be. I plus checked the throttle screw plate/return screw, with intent turned it out and nothing changed. put it support to exactly where it was. No vacuum leak sounds and all friends verified. I environment good about them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF connected it is abandoned measuring the let breathe that is getting when the MAF, in view of that if the intake manifold is sucking in let breathe the air to fuel ratio will be certainly out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. next carb cleaner spray can vaporizer in the area of the hissing similar to the engine executive and in the manner of you hear the engine stall or rev superior there is the leak ,could be a bad vacuum hose bad gasket on the manifold.