Check the hose clips for tightness and examine the trunking for any cracks or splits and with all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine executive and warm and subsequently vaporizer lighter gas /propane or brake cleaner more or less each joint in turn. If the engine rev s up 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 every outcome in insufficient fuel innate delivered to the engine. Might next be worth cleaning out the idle speed direct motor / valve as these acquire clogged taking place like 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. next the MAF is plugged in subsequently the car will stall unless I put my foot on the accelerator. There is furthermore an intermittent popping sound coming at idle.