Check the hose clips for tightness and inspect the trunking for any cracks or splits and with every the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best mannerism to locate a leak is to have the engine government and hot and next spray lighter gas /propane or brake cleaner roughly speaking each joint in turn. If the engine rev s taking place you ve found your leak.
Its moreover 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 consequences in insufficient fuel innate delivered to the engine. Might after that be worth cleaning out the idle zeal run motor / valve as these acquire clogged in the works in the same way as carbon and some brake cleaner washed through helps forgive things off.
I don't have any check engine lights unless I unplug the MAF sensor. behind the MAF is plugged in later the car will stall unless I put my foot upon the accelerator. There is afterward an intermittent popping hermetic coming at idle.