Mediamonkey11 gave me a trick to test for intake leaks...
Warm up the motor & Get a big can of o2 sensor safe carb cleaner, get it running around 1500rpms & spray anything intake/vacuum related, minus the shriek actual air inlet for your air box. If there is a leak it will suck in the non-combustible cleaner & the engine will stumble! (a rare few are combustible & will give an increase in rpms) If no change you know it's not an intake/vacuum leak, & can trouble shoot something else.
~psguardian
Warm up the motor & Get a big can of o2 sensor safe carb cleaner, get it running around 1500rpms & spray anything intake/vacuum related, minus the shriek actual air inlet for your air box. If there is a leak it will suck in the non-combustible cleaner & the engine will stumble! (a rare few are combustible & will give an increase in rpms) If no change you know it's not an intake/vacuum leak, & can trouble shoot something else.
~psguardian