Hello, I have repaired exceeding 30000 vehicles in my career and I dependence to question you questions back I am not there in person to build up facts, data, or to exam your vehicle. I may question you to take effect chemical analysis in my stead. If laboratory analysis is needed and you would rather not feign testing, I can present my best advice, Fuel pressure?
I started the car stirring this morning, it starts going on and runs at 1750 and within a minute or thus climbs more than 2500.. It is executive smooth though, just pretension future than it should be. I then checked the throttle screw plate/return screw, carefully turned it out and nothing changed. put it incite to exactly where it was. No vacuum leak sounds and every links verified. I mood fine not quite them as I've been in there a bunch of times..
This could be a large vacuum leak ,with the MAF linked it is deserted measuring the freshen that is getting past the MAF, correspondingly if the intake manifold is sucking in air the air to fuel ratio will be definitely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. as soon as carb cleaner vaporizer spray can in the place of the hissing once the engine handing out and later you listen the engine stall or rev well along there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.