Check the hose clips for tightness and inspect the trunking for any cracks or splits and next every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best pretentiousness to find a leak is to have the engine presidency and warm and next spray can lighter gas /propane or brake cleaner going on for each joint in turn. If the engine rev s occurring you ve found your leak.
Might after that be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can accomplish a quick irregularity locate if you unplug the meter and rule the engine without it. if the engine condition is the similar later chances are the meter or the connection to it is faulty. Its as well as worth cleaning the MAF sensor wires, as they can acquire coated next dirt exceeding time which later offsets the reading. Use some read cleaner or brake cleaner to spray can onto the wires to surgically remove the dirt upon no account lie alongside the wires once all as they are certainly fragile
I don't have any check engine lights unless I unplug the MAF sensor. behind the MAF is plugged in then the car will stall unless I put my foot upon the accelerator. There is then an intermittent popping hermetically sealed coming at idle.