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have a 2008 mustang gt 4.6 3v got from sell needed some parts someone took off put them back on and got some codes lean bank 1and 2 low voltage on mass air flow and it bops back through throttle body so I will tell you what it has on it shorty headers off road  pipe mag mufflers bbk62 throttle body and tuner not sure but it sounds like its got after market cams any help will be great 

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With aftermarket heads you should check to see if you have all the O2 sensors and that they are ugged in properly, check plugs and injectors. If an injector is stuck closes or restricted you can certainly run lean. As far as the MAF make sure nothing is stuck to it, I've seen a fly get sucked in and short one of those suckers out.

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