Check the hose clips for tightness and inspect the trunking for any cracks or splits and moreover every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best way to find a leak is to have the engine admin and hot and later spray can lighter gas /propane or brake cleaner roughly each joint in turn. If the engine rev s happening 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 do a quick defect find if you unplug the meter and govern the engine without it. if the engine condition is the thesame after that chances are the meter or the attachment to it is faulty. Its then worth cleaning the MAF sensor wires, as they can acquire coated similar to dirt more than times which then offsets the reading. Use some right to use cleaner or brake cleaner to spray onto the wires to surgically remove the dirt on no account touch the wires like whatever as they are enormously fragile
I don't have any check engine lights unless I unplug the MAF sensor. afterward the MAF is plugged in subsequently the car will stall unless I put my foot on the accelerator. There is as a consequence an intermittent popping strong coming at idle.