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how to do vacuum leak test???

2K views 1 reply 2 participants last post by  Mr.Flip 
#1 ·
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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