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Hey what's up everybody so I have a 2008 GMC Sierra 1500 6.0 l, so I started out getting a chamber 6 misfire reading ended up being a collapsed lifter but before I found that I literally replaced almost everything you could replace when it came to fuel system air system Chambers in the motors you name it I replaced all the injectors I replaced coil packs wires spark plugs Mass sensors you name it I replaced it so now I'm getting the code po507, the only downfall is it tells me to fix that problem to replace the throttle body housing or the idle control sensor and a few other things which I've done already does anybody have any ideas what it could be
 
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