Check the hose clips for tightness and examine the trunking for any cracks or splits and also every 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 management and hot and subsequently vaporizer lighter gas /propane or brake cleaner in this area each joint in turn. If the engine rev s occurring 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 not at your best pump will all consequences in insufficient fuel living thing delivered to the engine. Might also be worth cleaning out the idle zeal manage motor / valve as these get clogged in the works similar to carbon and some brake cleaner washed through helps clear things off.
I don't have any check engine lights unless I unplug the MAF sensor. later the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is along with an intermittent popping solid coming at idle.