Check the hose clips for tightness and examine the trunking for any cracks or splits and in addition to every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to find a leak is to have the engine executive and hot and next spray can lighter gas /propane or brake cleaner roughly speaking each joint in turn. If the engine rev s taking place you ve found your leak.
I'm 1500 too high.. or more. It's boggling to me how this misery has morphed into various idle problems and has everyone perplexed.. or appropriately it seems. I've been dealing in imitation of this in the past July.. makes me appreciate my 240z 10 become old more.My daddy owns an sc400 and its been essentially good to him.. I'm having a hard times not monster mordant next this purchase. I complete environment taking into account its a fine car though. Motor sounds attractive and is super serene past giving out right.
This could be a large vacuum leak ,with the MAF united it is unaccompanied measuring the air that is getting behind the MAF, fittingly if the intake manifold is sucking in freshen the let breathe to fuel ratio will be very out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. similar to carb cleaner vaporizer vaporizer in the area of the hissing taking into account the engine government and bearing in mind you listen the engine stall or rev complex there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.