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97 f150 5.4 p0171/0174/1157earnman 10-09-2008, 08:50 AM engine runs rough and lopes.code p0171 and p0174 came up.cleared codes and run key on engine run test and came up with code p1157.trouble shooter says if had codes 0171and0174 that upper intake gaskets bad?? i thought that was for the 4.0 engines?? earnman 03-12-2009, 08:53 PM thanks for all the help?? its been .....5 months but i figured it out .had a big crack in the pcv hose at the intake end. i really like this site but the last few times i have been on this site i have not gotten 1 response?? RahX 03-13-2009, 08:39 PM No response usually means nobody has anything to say :( vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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