Its a intake leak tester
That one is for my audi its a 2.5" PVC end cap with a hole drilled in the Center where you put a rubber valve stem in you then pull your maf sensor off and put that in place. And use a tire air chuck to put shop air in regulated to 8-10 psi but pop the oil fill cap off...
Or you can use intake medic and spray it around. Or use a intake tester that goes in right where the maf is and pop oil fill off and air up to 8 psi and listen for leaks and spray soapy water
You more than likely have a intake leak use a propane torch that is unlit and go around your intake and specifically injector cups with the engine cold but running it will rev up or idle differently. Whe you find the spot. Just be carefully of alternator and obviously flames
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