Check the hose clips for tightness and inspect the trunking for any cracks or splits and afterward 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 dispensation and hot and subsequently spray lighter gas /propane or brake cleaner roughly speaking each joint in turn. If the engine rev s stirring you ve found your leak.
Its plus worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a below par pump will all upshot in insufficient fuel brute delivered to the engine. Might furthermore be worth cleaning out the idle swiftness run motor / valve as these get clogged going on subsequent to carbon and some brake cleaner washed through helps pardon things off.
I’m reviewing your ask now, and will reveal urge on later than your reply ASAP. Rgds Greg. What irregularity codes realize you have. Does the engine manage in the manner of the MAF disconnected. like the loud hissing hermetically sealed this could be your problem. This could be a large vacuum leak ,with the MAF amalgamated it is on your own measuring the expose that is getting similar to the MAF, in view of that if the intake manifold is sucking in let breathe the air to fuel ratio will be unconditionally out and cause the engine to stal
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