Check the hose clips for tightness and inspect the trunking for any cracks or splits and with all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best way to locate a leak is to have the engine doling out and warm and later spray can lighter gas /propane or brake cleaner in relation to each joint in turn. If the engine rev s in the works you ve found your leak.
I'm 1500 too high.. or more. It's boggling to me how this pain has morphed into various idle problems and has everyone perplexed.. or consequently it seems. I've been dealing past this before July.. makes me appreciate my 240z 10 times more.My daddy owns an sc400 and its been in point of fact fine to him.. I'm having a difficult epoch not creature pointed in imitation of this purchase. I do quality subsequently its a fine car though. Motor sounds delightful and is super smooth next running right.
This could be a large vacuum leak ,with the MAF amalgamated it is by yourself measuring the air that is getting in imitation of the MAF, so if the intake manifold is sucking in freshen the expose to fuel ratio will be agreed out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. when carb cleaner spray spray can in the area of the hissing when the engine giving out and taking into consideration you listen the engine stall or rev progressive there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.