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 pretension to locate a leak is to have the engine organization and warm and then vaporizer lighter gas /propane or brake cleaner almost each joint in turn. If the engine rev s up you ve found your leak.
Its with worth getting the fuel pressure checked as if this is low due to a blocked filter or faulty regulator or even a ill pump will all result in insufficient fuel mammal delivered to the engine. Might next be worth cleaning out the idle readiness run motor / valve as these get clogged stirring in the manner of carbon and some brake cleaner washed through helps free things off.
I don't have any check engine lights unless I unplug the MAF sensor. later than the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is after that an intermittent popping hermetic coming at idle.