Rough Idle after start up

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Rough Idle after start up - 8/23/2007 9:23:20 PM    jrblaster   Posts: 2 Joined: 8/23/2007 Status: offline Anyone have any good ideas on where to start with two system codes? I have an 03 Sub w/the 5.3l with about 80K on it. P0171 System Too Lean (Bank 1) P0174 System Too Lean (Bank 2) I am just not sure where to start.  Just curious if anyone has any good ideas or clues where i can start wrangling this dragon.  It is a Z coded motor (E85 compatible) which I just dumped two or three tanks in on a trip from WI to CA.  Since then it has run like crap once I got back to CA.  I have dumped some Fuel system cleaner and Octane boost in it, in this last tank, no luck.  HELP?  I am fairly knowledgeable but this is stumping me on where to start, any help would be great.  Thanks, JrBlaster 03 Sub 03 Bonneville Post #: 1

RE: Rough Idle after start up - 8/25/2007 10:36:37 AM    p.hinds   Posts: 18 Joined: 8/18/2007 Status: offline intake gaskets are leaking,gm sells an updated gasket (in reply to jrblaster) Post #: 2

RE: Rough Idle after start up - 8/27/2007 6:32:57 PM    jrblaster   Posts: 2 Joined: 8/23/2007 Status: offline Thanks P.  I will give that a try first.  Thanks for the reply, JB (in reply to p.hinds) Post #: 3

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