Check the hose clips for tightness and inspect the trunking for any cracks or splits and also all the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best habit to find a leak is to have the engine management and warm and after that spray lighter gas /propane or brake cleaner roughly each joint in turn. If the engine rev s occurring you ve found your leak.
Might afterward be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick fault find if you unplug the meter and control the engine without it. if the engine condition is the similar then chances are the meter or the membership to it is faulty. Its in addition to worth cleaning the MAF sensor wires, as they can get coated subsequently dirt over era which then offsets the reading. Use some retrieve cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt on no account be next to the wires in the manner of all as they are utterly fragile
I don't have any check engine lights unless I unplug the MAF sensor. in imitation of the MAF is plugged in later the car will stall unless I put my foot upon the accelerator. There is next an intermittent popping strong coming at idle.