Check the hose clips for tightness and examine the trunking for any cracks or splits and furthermore every the vacuum system, the little bore pipes and fittings for cracks and missing parts. The best quirk to find a leak is to have the engine paperwork and hot and subsequently spray lighter gas /propane or brake cleaner with reference to each joint in turn. If the engine rev s occurring you ve found your leak.
Might next be worth checking the wiring and connector to the airflow meter for any signs of corrosion or damage. you can complete a quick idiosyncrasy find if you unplug the meter and run the engine without it. if the engine condition is the same subsequently chances are the meter or the connection to it is faulty. Its as a consequence worth cleaning the MAF sensor wires, as they can acquire coated gone dirt higher than period which then offsets the reading. Use some way in cleaner or brake cleaner to vaporizer onto the wires to cut off the dirt on no account adjoin the wires as soon as whatever as they are unconditionally fragile
I don't have any check engine lights unless I unplug the MAF sensor. in the manner of the MAF is plugged in next the car will stall unless I put my foot upon the accelerator. There is furthermore an intermittent popping solid coming at idle.