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Discussion Starter #1
I’ve got a vacuum leak that is almost as loud as the motor running, but I can’t pinpoint where it’s coming from. I’ve checked every line with starting fluid and I’ve got nothing. It sounds like it’s coming from the front right corner of the fuel rail (closest to battery) and I do get a slight idle change when spraying fluid in that area. Even still I can’t detect any damage or signs of leakage. Codes are present for lean run in both banks, idle is horrible and getting worse.
 

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02 Tundra / 92 Buick PA
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You might try an old school trick by using a hose to our ear and the other end as a probe around looking for the leak.
 
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