Check the hose clips for tightness and examine the trunking for any cracks or splits and afterward 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 handing out and warm and subsequently vaporizer lighter gas /propane or brake cleaner all but each joint in turn. If the engine rev s going on you ve found your leak.
Might as a consequence be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can get a quick aberration find if you unplug the meter and control the engine without it. if the engine condition is the thesame next chances are the meter or the membership to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated gone dirt more than times which later offsets the reading. Use some entrance cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account be adjacent to the wires later than anything as they are entirely fragile
I don't have any check engine lights unless I unplug the MAF sensor. bearing in mind the MAF is plugged in subsequently the car will stall unless I put my foot on the accelerator. There is next an intermittent popping hermetically sealed coming at idle.