Check the hose clips for tightness and examine the trunking for any cracks or splits and with all the vacuum system, the small bore pipes and fittings for cracks and missing parts. The best artifice to find a leak is to have the engine management and hot and later vaporizer lighter gas /propane or brake cleaner just about each joint in turn. If the engine rev s up you ve found your leak.
Might also be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick irregularity locate if you unplug the meter and manage the engine without it. if the engine condition is the same then chances are the meter or the relationship to it is faulty. Its furthermore worth cleaning the MAF sensor wires, as they can acquire coated later than dirt more than become old which later offsets the reading. Use some contact cleaner or brake cleaner to spray can onto the wires to sever the dirt upon no account adjoin the wires once anything as they are entirely fragile
I don't have any check engine lights unless I unplug the MAF sensor. in imitation of the MAF is plugged in next the car will stall unless I put my foot on the accelerator. There is in addition to an intermittent popping strong coming at idle.