Check the hose clips for tightness and inspect the trunking for any cracks or splits and next all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best pretentiousness to locate a leak is to have the engine management and warm and subsequently vaporizer lighter gas /propane or brake cleaner all but each joint in turn. If the engine rev s happening you ve found your leak.
Its next 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 bodily delivered to the engine. Might then be worth cleaning out the idle eagerness direct motor / valve as these get clogged going on subsequently carbon and some brake cleaner washed through helps pardon things off.
I don't have any check engine lights unless I unplug the MAF sensor. once the MAF is plugged in then the car will stall unless I put my foot on the accelerator. There is as well as an intermittent popping hermetic coming at idle.