Check the hose clips for tightness and examine 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 quirk to locate a leak is to have the engine admin and hot and after that vaporizer lighter gas /propane or brake cleaner not far off from each joint in turn. If the engine rev s stirring 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 complete a fast malformation find if you unplug the meter and run the engine without it. if the engine condition is the thesame subsequently chances are the meter or the relationship to it is faulty. Its along with worth cleaning the MAF sensor wires, as they can acquire coated afterward dirt exceeding epoch which subsequently offsets the reading. Use some entre cleaner or brake cleaner to spray onto the wires to surgically remove the dirt upon no account be adjacent to the wires next whatever as they are certainly fragile
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