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First you need something that makes smoke but not fire.....I use a thick rope with a smoldering end. You can also use a cigarette or cigar if you can tolerate the smoke. With the engine running, move your smoking instrument near the various pipes and hoses in the intake system (throttle body, vac lines, air-oil seperator, etc.) and see if any of them start sucking up the emitted smoke. If so you've found your leak.
The MAF (mass airflow sensor) is mounted in the intake pipe near the air filter housing. It has an electrical connector and it measures the amount of air entering the engine so the proper amount of fuel can be measured. An over-oiled K&N filter will contaminate the sensor, ruining its readings.
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