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am go to pep boys to get a can of smoke where do i put it to test for vacuum leak anyone please help thanks 2007 escalade base..

i got the code p0171 am check my fuel pressure,i did put new headers new intake am check thouse too while am at it..but i did not get this code untill today the intake and exhaust been on for a month...
 

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Had a shop do it not too long ago on my '07 ESV, He took off the vacuum going to the Booster from the engine and did it in there. Hopefully you found out by now but if not hope this helps!
 
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