Check the hose clips for tightness and examine the trunking for any cracks or splits and along with every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best mannerism to find a leak is to have the engine organization and warm and next vaporizer lighter gas /propane or brake cleaner roughly speaking each joint in turn. If the engine rev s in the works you ve found your leak.
Might then be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick malfunction find if you unplug the meter and control the engine without it. if the engine condition is the same later chances are the meter or the attachment to it is faulty. Its with worth cleaning the MAF sensor wires, as they can get coated later dirt higher than become old which later offsets the reading. Use some admission cleaner or brake cleaner to spray onto the wires to separate the dirt on no account touch the wires similar to whatever as they are completely fragile
I don't have any check engine lights unless I unplug the MAF sensor. later the MAF is plugged in later the car will stall unless I put my foot on the accelerator. There is furthermore an intermittent popping hermetically sealed coming at idle.